tests/graph.scm


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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2015-2022 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (test-graph)
  #:use-module (guix tests)
  #:use-module (guix graph)
  #:use-module (guix scripts graph)
  #:use-module (guix packages)
  #:use-module (guix derivations)
  #:use-module (guix store)
  #:use-module (guix monads)
  #:use-module (guix grafts)
  #:use-module (guix build-system gnu)
  #:use-module (guix build-system trivial)
  #:use-module (guix gexp)
  #:use-module (guix utils)
  #:use-module (gnu packages)
  #:use-module (gnu packages base)
  #:use-module (gnu packages bootstrap)
  #:use-module (gnu packages guile)
  #:use-module (gnu packages libunistring)
  #:use-module (gnu packages bootstrap)
  #:use-module (ice-9 match)
  #:use-module (ice-9 sandbox)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-11)
  #:use-module (srfi srfi-26)
  #:use-module (srfi srfi-64))

(define %store
  (open-connection-for-tests))

;; Globally disable grafts because they can trigger early builds.
(%graft? #f)

(define (make-recording-backend)
  "Return a <graph-backend> and a thunk that returns the recorded nodes and
edges."
  (let ((nodes '())
        (edges '()))
    (define (record-node id label port)
      (set! nodes (cons (list id label) nodes)))
    (define (record-edge source target port)
      (set! edges (cons (list source target) edges)))
    (define (return)
      (values (reverse nodes) (reverse edges)))

    (values (graph-backend "test" "This is the test backend."
                           (const #t) (const #t)
                           record-node record-edge)
            return)))

(define (package->tuple package)
  "Return a tuple representing PACKAGE as produced by %PACKAGE-NODE-TYPE."
  (list (object-address package)
        (package-full-name package)))

(define (edge->tuple source target)
  "Likewise for an edge from SOURCE to TARGET."
  (list (object-address source)
        (object-address target)))


(test-begin "graph")

(test-assert "package DAG"
  (let-values (((backend nodes+edges) (make-recording-backend)))
    (let* ((p1 (dummy-package "p1"))
           (p2 (dummy-package "p2" (inputs `(("p1" ,p1)))))
           (p3 (dummy-package "p3" (inputs `(("p2" ,p2) ("p1", p1))))))
      (run-with-store %store
        (export-graph (list p3) 'port
                      #:node-type %package-node-type
                      #:backend backend))
      ;; We should see nothing more than these 3 packages.
      (let-values (((nodes edges) (nodes+edges)))
        (and (equal? nodes (map package->tuple (list p3 p2 p1)))
             (equal? edges
                     (map edge->tuple
                          (list p3 p3 p2)
                          (list p2 p1 p1))))))))

(test-assert "package DAG, limited depth"
  (let-values (((backend nodes+edges) (make-recording-backend)))
    (let* ((p1 (dummy-package "p1"))
           (p2 (dummy-package "p2" (inputs `(("p1" ,p1)))))
           (p3 (dummy-package "p3" (inputs `(("p1" ,p1)))))
           (p4 (dummy-package "p4" (inputs `(("p2" ,p2) ("p3" ,p3))))))
      (run-with-store %store
        (export-graph (list p4) 'port
                      #:max-depth 1
                      #:node-type %package-node-type
                      #:backend backend))
      ;; We should see nothing more than these 3 packages.
      (let-values (((nodes edges) (nodes+edges)))
        (and (equal? nodes (map package->tuple (list p4 p2 p3)))
             (equal? edges
                     (map edge->tuple
                          (list p4 p4)
                          (list p2 p3))))))))

(test-assert "package DAG, oops it was a cycle"
  (let-values (((backend nodes+edges) (make-recording-backend)))
    (letrec ((p1 (dummy-package "p1" (inputs `(("p3" ,p3)))))
             (p2 (dummy-package "p2" (inputs `(("p1" ,p1)))))
             (p3 (dummy-package "p3" (inputs `(("p2" ,p2) ("p1", p1))))))
      (call-with-time-limit
       600 ;; If ever this test should fail, we still want it to terminate
       (lambda ()
         (run-with-store %store
           (export-graph (list p3) 'port
                         #:node-type %package-node-type
                         #:backend backend)))
       (lambda ()
         (run-with-store %store
           (export-graph
            (list (dummy-package "timeout-reached"))
            'port
            #:node-type %package-node-type
            #:backend backend))))
      ;; We should see nothing more than these 3 packages.
      (let-values (((nodes edges) (nodes+edges)))
        (and (equal? nodes (map package->tuple (list p3 p2 p1)))
             (equal? edges
                     (map edge->tuple
                          (list p3 p3 p2 p1)
                          (list p2 p1 p1 p3))))))))

(test-assert "reverse package DAG"
  (let-values (((backend nodes+edges) (make-recording-backend)))
    (run-with-store %store
      (export-graph (list libunistring) 'port
                    #:node-type %reverse-package-node-type
                    #:backend backend))
    ;; We should see nothing more than these 3 packages.
    (let-values (((nodes edges) (nodes+edges)))
      (and (member (package->tuple guile-2.0) nodes)
           (->bool (member (edge->tuple libunistring guile-2.0) edges))))))

(test-assert "bag-emerged DAG"
  (let-values (((backend nodes+edges) (make-recording-backend)))
    (let* ((o        (dummy-origin (method (lambda _
                                             (text-file "foo" "bar")))))
           (p        (dummy-package "p" (source o)))
           (implicit (map (match-lambda
                            ((label package) package)
                            ((label package output) package))
                          (standard-packages))))
      (run-with-store %store
        (export-graph (list p) 'port
                      #:node-type %bag-emerged-node-type
                      #:backend backend))
      ;; We should see exactly P and IMPLICIT, with one edge from P to each
      ;; element of IMPLICIT.  O must not appear among NODES.  Note: IMPLICIT
      ;; contains "glibc" twice, once for "out" and a second time for
      ;; "static", hence the 'delete-duplicates' call below.
      (let-values (((nodes edges) (nodes+edges)))
        (and (equal? (match nodes
                       (((labels names) ...)
                        names))
                     (map package-full-name
                          (cons p (delete-duplicates implicit))))
             (equal? (match edges
                       (((sources destinations) ...)
                        (zip (map store-path-package-name sources)
                             (map store-path-package-name destinations))))
                     (map (lambda (destination)
                            (list "p-0.drv"
                                  (string-append
                                   (package-full-name destination "-")
                                   ".drv")))
                          implicit)))))))

(test-assert "bag DAG"                            ;a big town in Iraq
  (let-values (((backend nodes+edges) (make-recording-backend)))
    (let ((p (dummy-package "p")))
      (run-with-store %store
        (export-graph (list p) 'port
                      #:node-type %bag-node-type
                      #:backend backend))
      ;; We should see P, its implicit inputs as well as the whole DAG, which
      ;; should include bootstrap binaries.
      (let-values (((nodes edges) (nodes+edges)))
        (every (lambda (name)
                 (find (cut string=? name <>)
                       (match nodes
                         (((labels names) ...)
                          names))))
               (match (%bootstrap-inputs)
                 (((labels packages) ...)
                  (map package-full-name (filter package? packages)))))))))

(test-assert "bag DAG, including origins"
  (let-values (((backend nodes+edges) (make-recording-backend)))
    (let* ((m (lambda* (uri hash-type hash name #:key system)
                (text-file "foo-1.2.3.tar.gz" "This is a fake!")))
           (o (origin
                (method m) (uri "the-uri")
                (sha256
                 (base32
                  "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"))))
           (p (dummy-package "p" (source o))))
      (run-with-store %store
        (export-graph (list p) 'port
                      #:node-type %bag-with-origins-node-type
                      #:backend backend))
      ;; We should see O among the nodes, with an edge coming from P.
      (let-values (((nodes edges) (nodes+edges)))
        (run-with-store %store
          (mlet %store-monad ((o* (lower-object o))
                              (p* (lower-object p))
                              (g  (lower-object (default-guile))))
            (return
             (and (find (match-lambda
                          ((file "the-uri") #t)
                          (_                #f))
                        nodes)
                  (find (match-lambda
                          ((source target)
                           (and (string=? source (derivation-file-name p*))
                                (string=? target o*))))
                        edges)

                  ;; There must also be an edge from O to G.
                  (find (match-lambda
                          ((source target)
                           (and (string=? source o*)
                                (string=? target (derivation-file-name g)))))
                        edges)))))))))

(test-assert "reverse bag DAG"
  (let-values (((dune camomile utop)
                (values (specification->package "dune")
                        (specification->package "ocaml-camomile")
                        (specification->package "ocaml-utop")))
               ((backend nodes+edges) (make-recording-backend)))
    (run-with-store %store
      (export-graph (list dune) 'port
                    #:node-type %reverse-bag-node-type
                    #:backend backend))

    (run-with-store %store
      (mlet %store-monad ((dune-drv       (package->derivation dune))
                          (camomile-drv   (package->derivation camomile))
                          (utop-drv       (package->derivation utop)))
        ;; CAMOMILE uses 'dune-build-system' so DUNE is a direct dependency.
        ;; UTOP is much higher in the stack but it should be there.
        (let-values (((nodes edges) (nodes+edges)))
          (return
           (and (member `(,(derivation-file-name camomile-drv)
                          ,(package-full-name camomile))
                        nodes)
                (->bool (member (map derivation-file-name
                                     (list dune-drv utop-drv))
                                edges)))))))))

(test-assert "derivation DAG"
  (let-values (((backend nodes+edges) (make-recording-backend)))
    (run-with-store %store
      (mlet* %store-monad ((txt   (text-file "text-file" "Hello!"))
                           (guile (package->derivation %bootstrap-guile))
                           (drv   (gexp->derivation "output"
                                                    #~(symlink #$txt #$output)
                                                    #:guile-for-build
                                                    guile)))
        ;; We should get at least these 3 nodes and corresponding edges.
        (mbegin %store-monad
          (export-graph (list drv) 'port
                        #:node-type %derivation-node-type
                        #:backend backend)
          (let-values (((nodes edges) (nodes+edges)))
            ;; XXX: For some reason we need to throw in some 'basename'.
            (return (and (match nodes
                           (((ids labels) ...)
                            (let ((ids (map basename ids)))
                              (every (lambda (item)
                                       (member (basename item) ids))
                                     (list txt
                                           (derivation-file-name drv)
                                           (derivation-file-name guile))))))
                         (every (cut member <>
                                     (map (lambda (edge)
                                            (map basename edge))
                                          edges))
                                (list (map (compose basename derivation-file-name)
                                           (list drv guile))
                                      (list (basename (derivation-file-name drv))
                                            (basename txt))))))))))))

(test-assert "reference DAG"
  (let-values (((backend nodes+edges) (make-recording-backend)))
    (run-with-store %store
      (mlet* %store-monad ((txt   (text-file "text-file" "Hello!"))
                           (guile (package->derivation %bootstrap-guile))
                           (drv   (gexp->derivation "output"
                                                    #~(symlink #$txt #$output)
                                                    #:guile-for-build
                                                    guile))
                           (out -> (derivation->output-path drv)))
        ;; We should see only OUT and TXT, with an edge from the former to the
        ;; latter.
        (mbegin %store-monad
          (built-derivations (list drv))
          (export-graph (list (derivation->output-path drv)) 'port
                        #:node-type %reference-node-type
                        #:backend backend)
          (let-values (((nodes edges) (nodes+edges)))
            (return
             (and (equal? (match nodes
                            (((ids labels) ...)
                             ids))
                          (list out txt))
                  (equal? edges `((,out ,txt)))))))))))

(test-assert "referrer DAG"
  (let-values (((backend nodes+edges) (make-recording-backend)))
    (run-with-store %store
      (mlet* %store-monad ((txt   (text-file "referrer-node" (random-text)))
                           (drv   (gexp->derivation "referrer"
                                                    #~(symlink #$txt #$output)))
                           (out -> (derivation->output-path drv)))
        ;; We should see only TXT and OUT, with an edge from the former to the
        ;; latter.
        (mbegin %store-monad
          (built-derivations (list drv))
          (export-graph (list txt) 'port
                        #:node-type %referrer-node-type
                        #:backend backend)
          (let-values (((nodes edges) (nodes+edges)))
            (return
             (and (equal? (match nodes
                            (((ids labels) ...)
                             ids))
                          (list txt out))
                  (equal? edges `((,txt ,out)))))))))))

(test-assert "module graph"
  (let-values (((backend nodes+edges) (make-recording-backend)))
    (run-with-store %store
      (export-graph '((gnu packages guile)) 'port
                    #:node-type %module-node-type
                    #:backend backend))

    (let-values (((nodes edges) (nodes+edges)))
      (and (member '(gnu packages guile)
                   (match nodes
                     (((ids labels) ...) ids)))
           (->bool (and (member (list '(gnu packages guile)
                                      '(gnu packages libunistring))
                                edges)
                        (member (list '(gnu packages guile)
                                      '(gnu packages bdw-gc))
                                edges)))))))

(test-assert "node-edges"
  (run-with-store %store
    (let ((packages (fold-packages cons '())))
      (mlet %store-monad ((edges (node-edges %package-node-type packages)))
        (return (and (null? (edges hello))
                     (lset= eq?
                            (edges guile-2.0)
                            (match (package-direct-inputs guile-2.0)
                              (((labels packages _ ...) ...)
                               packages)))))))))

(test-assert "node-transitive-edges + node-back-edges"
  (run-with-store %store
    (let ((packages   (fold-packages cons '()))
          (bootstrap? (lambda (package)
                        (string-contains
                         (location-file (package-location package))
                         "bootstrap.scm")))
          (trivial?   (lambda (package)
                        (eq? (package-build-system package)
                             trivial-build-system))))
      (mlet %store-monad ((edges (node-back-edges %bag-node-type packages)))
        (let* ((glibc      (canonical-package glibc))
               (dependents (node-transitive-edges (list glibc) edges))
               (diff       (lset-difference eq? packages dependents)))
          ;; All the packages depend on libc, except bootstrap packages and
          ;; some that use TRIVIAL-BUILD-SYSTEM.
          (return (null? (remove (lambda (package)
                                   (or (trivial? package)
                                       (bootstrap? package)))
                                 diff))))))))

(test-assert "node-transitive-edges, no duplicates"
  (run-with-store %store
    (let* ((p0  (dummy-package "p0"))
           (p1a (dummy-package "p1a" (inputs `(("p0" ,p0)))))
           (p1b (dummy-package "p1b" (inputs `(("p0" ,p0)))))
           (p2  (dummy-package "p2" (inputs `(("p1a" ,p1a) ("p1b" ,p1b))))))
      (mlet %store-monad ((edges (node-edges %package-node-type
                                             (list p2 p1a p1b p0))))
        (return (lset= eq? (node-transitive-edges (list p2) edges)
                       (list p1a p1b p0)))))))

(test-assert "node-transitive-edges, references"
  (run-with-store %store
    (mlet* %store-monad ((d0 (package->derivation %bootstrap-guile))
                         (d1 (gexp->derivation "d1"
                                               #~(begin
                                                   (mkdir #$output)
                                                   (symlink #$%bootstrap-guile
                                                            (string-append
                                                             #$output "/l")))))
                         (d2 (gexp->derivation "d2"
                                               #~(begin
                                                   (mkdir #$output)
                                                   (symlink #$d1
                                                            (string-append
                                                             #$output "/l")))))
                         (_  (built-derivations (list d2)))
                         (->node -> (node-type-convert %reference-node-type))
                         (o2      (->node (derivation->output-path d2)))
                         (o1      (->node (derivation->output-path d1)))
                         (o0      (->node (derivation->output-path d0)))
                         (edges   (node-edges %reference-node-type
                                              (append o0 o1 o2)))
                         (reqs    ((store-lift requisites) o2)))
      (return (lset= string=?
                     (append o2 (node-transitive-edges o2 edges)) reqs)))))

(test-equal "node-reachable-count"
  '(3 3)
  (run-with-store %store
    (let* ((p0  (dummy-package "p0"))
           (p1a (dummy-package "p1a" (inputs `(("p0" ,p0)))))
           (p1b (dummy-package "p1b" (inputs `(("p0" ,p0)))))
           (p2  (dummy-package "p2" (inputs `(("p1a" ,p1a) ("p1b" ,p1b))))))
      (mlet* %store-monad ((all -> (list p2 p1a p1b p0))
                           (edges  (node-edges %package-node-type all))
                           (back   (node-back-edges %package-node-type all)))
        (return (list (node-reachable-count (list p2) edges)
                      (node-reachable-count (list p0) back)))))))

(test-equal "shortest-path, packages + derivations"
  '(("p5" "p4" "p1" "p0")
    ("p3" "p2" "p1" "p0")
    #f
    ("p5-0.drv" "p4-0.drv" "p1-0.drv" "p0-0.drv"))
  (run-with-store %store
    (let* ((p0 (dummy-package "p0"))
           (p1 (dummy-package "p1" (inputs `(("p0" ,p0)))))
           (p2 (dummy-package "p2" (inputs `(("p1" ,p1)))))
           (p3 (dummy-package "p3" (inputs `(("p2" ,p2)))))
           (p4 (dummy-package "p4" (inputs `(("p1" ,p1)))))
           (p5 (dummy-package "p5" (inputs `(("p4" ,p4) ("p3" ,p3))))))
      (mlet* %store-monad ((path1 (shortest-path p5 p0 %package-node-type))
                           (path2 (shortest-path p3 p0 %package-node-type))
                           (nope  (shortest-path p3 p4 %package-node-type))
                           (drv5  (package->derivation p5))
                           (drv0  (package->derivation p0))
                           (path3 (shortest-path drv5 drv0
                                                 %derivation-node-type)))
        (return (append (map (lambda (path)
                               (and path (map package-name path)))
                             (list path1 path2 nope))
                        (list (map (node-type-label %derivation-node-type)
                                   path3))))))))

(test-equal "shortest-path, reverse packages"
  '("libffi" "guile" "guile-json")
  (run-with-store %store
    (mlet %store-monad ((path (shortest-path (specification->package "libffi")
                                             guile-json
                                             %reverse-package-node-type)))
      (return (map package-name path)))))

(test-equal "shortest-path, references"
  `(("d2" "d1" ,(package-full-name %bootstrap-guile "-"))
    (,(package-full-name %bootstrap-guile "-") "d1" "d2"))
  (run-with-store %store
    (mlet* %store-monad ((d0 (package->derivation %bootstrap-guile))
                         (d1 (gexp->derivation "d1"
                                               #~(begin
                                                   (mkdir #$output)
                                                   (symlink #$%bootstrap-guile
                                                            (string-append
                                                             #$output "/l")))))
                         (d2 (gexp->derivation "d2"
                                               #~(begin
                                                   (mkdir #$output)
                                                   (symlink #$d1
                                                            (string-append
                                                             #$output "/l")))))
                         (_  (built-derivations (list d2)))
                         (->node -> (node-type-convert %reference-node-type))
                         (o2   (->node (derivation->output-path d2)))
                         (o0   (->node (derivation->output-path d0)))
                         (path (shortest-path (first o2) (first o0)
                                              %reference-node-type))
                         (rpath (shortest-path (first o0) (first o2)
                                               %referrer-node-type)))
      (return (list (map (node-type-label %reference-node-type) path)
                    (map (node-type-label %referrer-node-type) rpath))))))

(test-end "graph")
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016 David Craven <david@craven.ch>
;;; Copyright © 2016 Eric Le Bihan <eric.le.bihan.dev@free.fr>
;;; Copyright © 2016 Nikita <nikita@n0.is>
;;; Copyright © 2017 Ben Woodcroft <donttrustben@gmail.com>
;;; Copyright © 2017, 2018 Nikolai Merinov <nikolai.merinov@member.fsf.org>
;;; Copyright © 2017, 2019 Efraim Flashner <efraim@flashner.co.il>
;;; Copyright © 2018, 2019 Tobias Geerinckx-Rice <me@tobias.gr>
;;; Copyright © 2018 Danny Milosavljevic <dannym+a@scratchpost.org>
;;; Copyright © 2019 Ivan Petkov <ivanppetkov@gmail.com>
;;; Copyright © 2020 Jakub Kądziołka <kuba@kadziolka.net>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu packages rust)
  #:use-module (gnu packages base)
  #:use-module (gnu packages bison)
  #:use-module (gnu packages bootstrap)
  #:use-module (gnu packages cmake)
  #:use-module (gnu packages compression)
  #:use-module (gnu packages curl)
  #:use-module (gnu packages elf)
  #:use-module (gnu packages flex)
  #:use-module (gnu packages gcc)
  #:use-module (gnu packages gdb)
  #:use-module (gnu packages jemalloc)
  #:use-module (gnu packages linux)
  #:use-module (gnu packages llvm)
  #:use-module (gnu packages pkg-config)
  #:use-module (gnu packages python)
  #:use-module (gnu packages ssh)
  #:use-module (gnu packages tls)
  #:use-module (gnu packages)
  #:use-module (guix build-system cargo)
  #:use-module (guix build-system gnu)
  #:use-module (guix build-system trivial)
  #:use-module (guix download)
  #:use-module (guix git-download)
  #:use-module ((guix licenses) #:prefix license:)
  #:use-module (guix packages)
  #:use-module ((guix build utils) #:select (alist-replace))
  #:use-module (guix utils)
  #:use-module (ice-9 match)
  #:use-module (srfi srfi-26))

;; This is the hash for the empty file, and the reason it's relevant is not
;; the most obvious.
;;
;; The root of the problem is that Cargo keeps track of a file called
;; Cargo.lock, that contains the hash of the tarball source of each dependency.
;;
;; However, tarball sources aren't handled well by Guix because of the need to
;; patch shebangs in any helper scripts. This is why we use Cargo's vendoring
;; capabilities, where instead of the tarball, a directory is provided in its
;; place. (In the case of rustc, the source code already ships with vendored
;; dependencies, but crates built with cargo-build-system undergo vendoring
;; during the build.)
;;
;; To preserve the advantages of checksumming, vendored dependencies contain
;; a file called .cargo-checksum.json, which contains the hash of the tarball,
;; as well as the list of files in it, with the hash of each file.
;;
;; The patch-cargo-checksums phase of cargo-build-system runs after
;; any Guix-specific patches to the vendored dependencies and regenerates the
;; .cargo-checksum.json files, but it's hard to know the tarball checksum that
;; should be written to the file - and taking care of any unhandled edge case
;; would require rebuilding everything that depends on rust. This is why we lie,
;; and say that the tarball has the hash of an empty file. It's not a problem
;; because cargo-build-system removes the Cargo.lock file. We can't do that
;; for rustc because of a quirk of its build system, so we modify the lock file
;; to substitute the hash.
(define %cargo-reference-hash
  "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855")

(define* (nix-system->gnu-triplet-for-rust
          #:optional (system (%current-system)))
  (match system
    ("x86_64-linux"   "x86_64-unknown-linux-gnu")
    ("i686-linux"     "i686-unknown-linux-gnu")
    ("armhf-linux"    "armv7-unknown-linux-gnueabihf")
    ("aarch64-linux"  "aarch64-unknown-linux-gnu")
    ("mips64el-linux" "mips64el-unknown-linux-gnuabi64")
    (_                (nix-system->gnu-triplet system))))

(define* (rust-uri version #:key (dist "static"))
  (string-append "https://" dist ".rust-lang.org/dist/"
                 "rustc-" version "-src.tar.gz"))

(define* (rust-bootstrapped-package base-rust version checksum)
  "Bootstrap rust VERSION with source checksum CHECKSUM using BASE-RUST."
  (package
    (inherit base-rust)
    (version version)
    (source
      (origin
        (inherit (package-source base-rust))
        (uri (rust-uri version))
        (sha256 (base32 checksum))))
    (native-inputs
     (alist-replace "cargo-bootstrap" (list base-rust "cargo")
                    (alist-replace "rustc-bootstrap" (list base-rust)
                                   (package-native-inputs base-rust))))))

(define-public mrustc
  (let ((rustc-version "1.19.0"))
    (package
      (name "mrustc")
      (version "0.9")
      (source (origin
                (method git-fetch)
                (uri (git-reference
                      (url "https://github.com/thepowersgang/mrustc")
                      (commit (string-append "v" version))))
                (file-name (git-file-name name version))
                (sha256
                 (base32
                  "194ny7vsks5ygiw7d8yxjmp1qwigd71ilchis6xjl6bb2sj97rd2"))))
      (outputs '("out" "cargo"))
      (build-system gnu-build-system)
      (inputs
       `(("zlib" ,zlib)))
      (native-inputs
       `(("bison" ,bison)
         ("flex" ,flex)
         ;; Required for the libstd sources.
         ("rustc" ,(package-source rust-1.19))))
      (arguments
       `(#:test-target "test"
         #:make-flags
         (list ,(string-append "RUSTC_TARGET="
                               (or (%current-target-system)
                                   (nix-system->gnu-triplet-for-rust))))
         #:phases
         (modify-phases %standard-phases
          (add-after 'unpack 'patch-date
            (lambda _
              (substitute* "Makefile"
               (("shell date") "shell date -d @1"))
              (substitute* "run_rustc/Makefile"
               (("[$]Vtime ") "$V "))
              #t))
           (add-after 'patch-date 'unpack-target-compiler
             (lambda* (#:key inputs outputs #:allow-other-keys)
               (invoke "tar" "xf" (assoc-ref inputs "rustc"))
               (chdir ,(string-append "rustc-" rustc-version "-src"))
               (invoke "patch" "-p0" ,(string-append "../rustc-" rustc-version
                                                     "-src.patch"))
               (chdir "..")
               (setenv "RUSTC_VERSION" ,rustc-version)
               (setenv "MRUSTC_TARGET_VER"
                ,(version-major+minor rustc-version))
               (setenv "OUTDIR_SUF" "")
               #t))
           (replace 'configure
             (lambda* (#:key inputs #:allow-other-keys)
               (setenv "CC" (string-append (assoc-ref inputs "gcc")
                                           "/bin/gcc"))
               (setenv "CXX" (string-append (assoc-ref inputs "gcc")
                                            "/bin/g++"))
               #t))
           (add-after 'build 'build-minicargo
             (lambda* (#:key make-flags #:allow-other-keys)
               ;; TODO: minicargo.mk: RUSTC_VERSION=$(RUSTC_VERSION) RUSTC_CHANNEL=$(RUSTC_SRC_TY) OUTDIR_SUF=$(OUTDIR_SUF)
               (apply invoke "make" "-f" "minicargo.mk" "LIBS" make-flags)
               (apply invoke "make" "-C" "tools/minicargo" make-flags)))
           ;(add-after 'check 'check-locally
           ;  (lambda* (#:key make-flags #:allow-other-keys)
           ;    ;; The enum test wouldn't work otherwise.
           ;    ;; See <https://github.com/thepowersgang/mrustc/issues/137>.
           ;    (setenv "MRUSTC_TARGET_VER" ,(version-major+minor rustc-version))
           ;    (apply invoke "make" "local_tests" make-flags)))
           (replace 'install
             (lambda* (#:key inputs outputs #:allow-other-keys)
               (let* ((out (assoc-ref outputs "out"))
                      (bin (string-append out "/bin"))
                      (tools-bin (string-append out "/tools/bin"))
                      (cargo-out (assoc-ref outputs "cargo"))
                      (cargo-bin (string-append cargo-out "/bin"))
                      (lib (string-append out "/lib"))
                      (lib/rust (string-append lib "/mrust"))
                      (gcc (assoc-ref inputs "gcc"))
                      (run_rustc (string-append out
                                                "/share/mrustc/run_rustc")))
                 ;; These files are not reproducible.
                 (for-each delete-file (find-files "output" "\\.txt$"))
                 ;(delete-file-recursively "output/local_tests")
                 (mkdir-p (dirname lib/rust))
                 (copy-recursively "output" lib/rust)
                 (mkdir-p bin)
                 (mkdir-p tools-bin)
                 (install-file "bin/mrustc" bin)
                 ;; minicargo uses relative paths to resolve mrustc.
                 (install-file "tools/bin/minicargo" tools-bin)
                 (install-file "tools/bin/minicargo" cargo-bin)
                 (mkdir-p run_rustc)
                 (copy-file "run_rustc/Makefile"
                            (string-append run_rustc "/Makefile"))
                 #t))))))
      (synopsis "Compiler for the Rust programming language")
      (description "Rust is a systems programming language that provides memory
safety and thread safety guarantees.")
      (home-page "https://github.com/thepowersgang/mrustc")
      ;; Dual licensed.
      (license (list license:asl2.0 license:expat)))))

(define rust-1.19
  (package
    (name "rust")
    (version "1.19.0")
    (source
      (origin
        (method url-fetch)
        (uri (rust-uri "1.19.0"))
        (sha256 (base32 "0l8c14qsf42rmkqy92ahij4vf356dbyspxcips1aswpvad81y8qm"))
        (modules '((guix build utils)))
        (snippet '(begin (delete-file-recursively "src/llvm") #t))
        (patches (search-patches "rust-1.19-mrustc.patch"))))
    (outputs '("out" "cargo"))
    (properties '((timeout . 72000)               ;20 hours
                  (max-silent-time . 18000)))     ;5 hours (for armel)
    (arguments
     `(#:imported-modules ,%cargo-utils-modules ;for `generate-all-checksums'
       #:modules ((guix build utils) (ice-9 match) (guix build gnu-build-system))
       #:phases
       (modify-phases %standard-phases
         (add-after 'unpack 'set-env
           (lambda* (#:key inputs #:allow-other-keys)
             ;; Disable test for cross compilation support.
             (setenv "CFG_DISABLE_CROSS_TESTS" "1")
             (setenv "SHELL" (which "sh"))
             (setenv "CONFIG_SHELL" (which "sh"))
             (setenv "CC" (string-append (assoc-ref inputs "gcc") "/bin/gcc"))
             ;; guix llvm-3.9.1 package installs only shared libraries
             (setenv "LLVM_LINK_SHARED" "1")
             #t))
         (add-after 'unpack 'patch-cargo-tomls
           (lambda* (#:key inputs outputs #:allow-other-keys)
             (substitute* "src/librustc_errors/Cargo.toml"
               (("[[]dependencies[]]") "
[dependencies]
term = \"0.4.4\"
"))
             (substitute* "src/librustc/Cargo.toml"
               (("[[]dependencies[]]") "
[dependencies]
getopts = { path = \"../libgetopts\" }
"))
             (substitute* "src/librustdoc/Cargo.toml"
               (("[[]dependencies[]]") "
[dependencies]
test = { path = \"../libtest\" }
"))
             #t))
         (add-after 'unpack 'patch-tests
           (lambda* (#:key inputs #:allow-other-keys)
             (let ((bash (assoc-ref inputs "bash")))
               (substitute* "src/libstd/process.rs"
                 ;; The newline is intentional.
                 ;; There's a line length "tidy" check in Rust which would
                 ;; fail otherwise.
                 (("\"/bin/sh\"") (string-append "\n\"" bash "/bin/sh\"")))
               (substitute* "src/libstd/net/tcp.rs"
                 ;; There is no network in build environment
                 (("fn connect_timeout_unroutable")
                  "#[ignore]\nfn connect_timeout_unroutable"))
               ;; <https://lists.gnu.org/archive/html/guix-devel/2017-06/msg00222.html>
               (substitute* "src/libstd/sys/unix/process/process_common.rs"
                (("fn test_process_mask") "#[allow(unused_attributes)]
    #[ignore]
    fn test_process_mask"))
               #t)))
         (add-after 'patch-tests 'patch-aarch64-test
           (lambda* _
             (substitute* "src/librustc_back/dynamic_lib.rs"
               ;; This test is known to fail on aarch64 and powerpc64le:
               ;; https://github.com/rust-lang/rust/issues/45410
               (("fn test_loading_cosine") "#[ignore]\nfn test_loading_cosine"))
             #t))
         (add-after 'patch-tests 'use-readelf-for-tests
           (lambda* _
             ;; nm doesn't recognize the file format because of the
             ;; nonstandard sections used by the Rust compiler, but readelf
             ;; ignores them.
             (substitute* "src/test/run-make/atomic-lock-free/Makefile"
               (("\tnm ")
                "\treadelf -c "))
             #t))
         (add-after 'patch-tests 'remove-unsupported-tests
           (lambda* _
             ;; Our ld-wrapper cannot process non-UTF8 bytes in LIBRARY_PATH.
             ;; <https://lists.gnu.org/archive/html/guix-devel/2017-06/msg00193.html>
             (delete-file-recursively "src/test/run-make/linker-output-non-utf8")
             #t))
         (add-after 'patch-source-shebangs 'patch-cargo-checksums
           (lambda* _
             (use-modules (guix build cargo-utils))
             (substitute* "src/Cargo.lock"
               (("(\"checksum .* = )\".*\"" all name)
                (string-append name "\"" ,%cargo-reference-hash "\"")))
             (generate-all-checksums "src/vendor")
             #t))
         ;; This phase is overridden by newer versions.
         (replace 'configure
           (const #t))
         ;; This phase is overridden by newer versions.
         (replace 'build
           (lambda* (#:key inputs outputs #:allow-other-keys)
             (let ((rustc-bootstrap (assoc-ref inputs "rustc-bootstrap")))
               (setenv "CFG_COMPILER_HOST_TRIPLE"
                ,(nix-system->gnu-triplet (%current-system)))
               (setenv "CFG_RELEASE" "")
               (setenv "CFG_RELEASE_CHANNEL" "stable")
               (setenv "CFG_LIBDIR_RELATIVE" "lib")
               (setenv "CFG_VERSION" "1.19.0-stable-mrustc")
               (setenv "MRUSTC_TARGET_VER" ,(version-major+minor version))
               ; bad: (setenv "CFG_PREFIX" "mrustc") ; FIXME output path.
               (mkdir-p "output")
               ;; mrustc 0.9 doesn't check the search paths for crates anymore.
               (copy-recursively (string-append rustc-bootstrap "/lib/mrust")
                                 "output")
               (invoke (string-append rustc-bootstrap "/tools/bin/minicargo")
                       "src/rustc" "--vendor-dir" "src/vendor"
                       "--output-dir" "output/rustc-build"
                       "-L" (string-append rustc-bootstrap "/lib/mrust")
                       "-j" "1")
               (setenv "CFG_COMPILER_HOST_TRIPLE" #f)
               (setenv "CFG_RELEASE" #f)
               (setenv "CFG_RELEASE_CHANNEL" #f)
               (setenv "CFG_VERSION" #f)
               (setenv "CFG_PREFIX" #f)
               (setenv "CFG_LIBDIR_RELATIVE" #f)
               (invoke (string-append rustc-bootstrap "/tools/bin/minicargo")
                       "src/tools/cargo" "--vendor-dir" "src/vendor"
                       "--output-dir" "output/cargo-build"
                       "-L" "output/"
                       "-L" (string-append rustc-bootstrap "/lib/mrust")
                       "-j" "1")
               ;; Now use the newly-built rustc to build the libraries.
               ;; One day that could be replaced by:
               ;; (invoke "output/cargo-build/cargo" "build"
               ;;         "--manifest-path" "src/bootstrap/Cargo.toml"
               ;;         "--verbose") ; "--locked" "--frozen"
               ;; but right now, Cargo has problems with libstd's circular
               ;; dependencies.
               (mkdir-p "output/target-libs")
               (for-each (match-lambda
                          ((name . flags)
                            (write name)
                            (newline)
                            (apply invoke
                                   "output/rustc-build/rustc"
                                   "-C" (string-append "linker="
                                                       (getenv "CC"))
                                   ;; Required for libterm.
                                   "-Z" "force-unstable-if-unmarked"
                                   "-L" "output/target-libs"
                                   (string-append "src/" name "/lib.rs")
                                   "-o"
                                   (string-append "output/target-libs/"
                                                  (car (string-split name #\/))
                                                  ".rlib")
                                   flags)))
                         '(("libcore")
                           ("libstd_unicode")
                           ("liballoc")
                           ("libcollections")
                           ("librand")
                           ("liblibc/src" "--cfg" "stdbuild")
                           ("libunwind" "-l" "gcc_s")
                           ("libcompiler_builtins")
                           ("liballoc_system")
                           ("libpanic_unwind")
                           ;; Uses "cc" to link.
                           ("libstd" "-l" "dl" "-l" "rt" "-l" "pthread")
                           ("libarena")

                           ;; Test dependencies:

                           ("libgetopts")
                           ("libterm")
                           ("libtest")))
               #t)))
         ;; This phase is overridden by newer versions.
         (replace 'check
           (const #t))
         ;; This phase is overridden by newer versions.
         (replace 'install
           (lambda* (#:key inputs outputs #:allow-other-keys)
             (let* ((out (assoc-ref outputs "out"))
                    (target-system ,(or (%current-target-system)
                                        (nix-system->gnu-triplet
                                         (%current-system))))
                    (out-libs (string-append out "/lib/rustlib/"
                                             target-system "/lib")))
                                        ;(setenv "CFG_PREFIX" out)
               (mkdir-p out-libs)
               (copy-recursively "output/target-libs" out-libs)
               (install-file "output/rustc-build/rustc"
                             (string-append out "/bin"))
               (install-file "output/rustc-build/rustdoc"
                             (string-append out "/bin"))
               (install-file "output/cargo-build/cargo"
                             (string-append (assoc-ref outputs "cargo")
                                            "/bin")))
             #t)))))
    (build-system gnu-build-system)
    (native-inputs
     `(("bison" ,bison) ; For the tests
       ("cmake" ,cmake-minimal)
       ("flex" ,flex) ; For the tests
       ("gdb" ,gdb)   ; For the tests
       ("procps" ,procps) ; For the tests
       ("python-2" ,python-2)
       ("rustc-bootstrap" ,mrustc)
       ("cargo-bootstrap" ,mrustc "cargo")
       ("pkg-config" ,pkg-config) ; For "cargo"
       ("which" ,which)))
    (inputs
     `(("jemalloc" ,jemalloc-4.5.0)
       ("llvm" ,llvm-3.9.1)
       ("openssl" ,openssl-1.0)
       ("libssh2" ,libssh2) ; For "cargo"
       ("libcurl" ,curl)))  ; For "cargo"

    ;; rustc invokes gcc, so we need to set its search paths accordingly.
    ;; Note: duplicate its value here to cope with circular dependencies among
    ;; modules (see <https://bugs.gnu.org/31392>).
    (native-search-paths
     (list (search-path-specification
            (variable "C_INCLUDE_PATH")
            (files '("include")))
           (search-path-specification
            (variable "CPLUS_INCLUDE_PATH")
            (files '("include/c++" "include")))
           (search-path-specification
            (variable "LIBRARY_PATH")
            (files '("lib" "lib64")))))

    (synopsis "Compiler for the Rust progamming language")
    (description "Rust is a systems programming language that provides memory
safety and thread safety guarantees.")
    (home-page "https://www.rust-lang.org")
    ;; Dual licensed.
    (license (list license:asl2.0 license:expat))))

(define-public rust-1.20
  (let ((base-rust
         (rust-bootstrapped-package rust-1.19 "1.20.0"
          "0542y4rnzlsrricai130mqyxl8r6rd991frb4qsnwb27yigqg91a")))
    (package
      (inherit base-rust)
      (source
        (origin
          (inherit (package-source base-rust))
          (snippet '(begin
                      (delete-file-recursively "src/jemalloc")
                      (delete-file-recursively "src/llvm")
                      #t))
          (patches '())))
      (native-inputs
       `(;; The tests fail with newer versions of GNU Make.
         ("make" ,gnu-make-4.2)
         ,@(package-native-inputs base-rust)))
      (outputs '("out" "doc" "cargo"))
      ;; Since rust-1.19 is local, it's quite probable that Hydra
      ;; will build rust-1.19 only as a dependency of rust-1.20.
      ;; But then Hydra will use the wrong properties, the ones here,
      ;; for rust-1.19.  Therefore, we copied the properties of
      ;; rust-1.19 here.
      (properties '((timeout . 72000)               ;20 hours
                    (max-silent-time . 18000)))     ;5 hours (for armel)
      (arguments
       (substitute-keyword-arguments (package-arguments rust-1.19)
         ((#:phases phases)
          `(modify-phases ,phases
             (add-after 'patch-tests 'patch-cargo-tests
               (lambda _
                 (substitute* "src/tools/cargo/tests/build.rs"
                  (("/usr/bin/env") (which "env"))
                  ;; Guix llvm is compiled without asmjs-unknown-emscripten.
                  (("fn wasm32_final_outputs") "#[ignore]\nfn wasm32_final_outputs"))
                 (substitute* "src/tools/cargo/tests/death.rs"
                  ;; This is stuck when built in container.
                  (("fn ctrl_c_kills_everyone") "#[ignore]\nfn ctrl_c_kills_everyone"))
                 ;; Prints test output in the wrong order when built on
                 ;; i686-linux.
                 (substitute* "src/tools/cargo/tests/test.rs"
                   (("fn cargo_test_env") "#[ignore]\nfn cargo_test_env"))

                 ;; These tests pull in a dependency on "git", which changes
                 ;; too frequently take part in the Rust toolchain.
                 (substitute* "src/tools/cargo/tests/new.rs"
                   (("fn author_prefers_cargo") "#[ignore]\nfn author_prefers_cargo")
                   (("fn finds_author_git") "#[ignore]\nfn finds_author_git")
                   (("fn finds_local_author_git") "#[ignore]\nfn finds_local_author_git"))
                 #t))
             (add-after 'patch-cargo-tests 'ignore-glibc-2.27-incompatible-test
               ;; https://github.com/rust-lang/rust/issues/47863
               (lambda _
                 (substitute* "src/test/run-pass/out-of-stack.rs"
                   (("// ignore-android") "// ignore-test\n// ignore-android"))
                 #t))
             (replace 'configure
               (lambda* (#:key inputs outputs #:allow-other-keys)
                 (let* ((out (assoc-ref outputs "out"))
                        (doc (assoc-ref outputs "doc"))
                        (gcc (assoc-ref inputs "gcc"))
                        (gdb (assoc-ref inputs "gdb"))
                        (binutils (assoc-ref inputs "binutils"))
                        (python (assoc-ref inputs "python-2"))
                        (rustc (assoc-ref inputs "rustc-bootstrap"))
                        (cargo (assoc-ref inputs "cargo-bootstrap"))
                        (llvm (assoc-ref inputs "llvm"))
                        (jemalloc (assoc-ref inputs "jemalloc")))
                   (call-with-output-file "config.toml"
                     (lambda (port)
                       (display (string-append "
[llvm]
[build]
cargo = \"" cargo "/bin/cargo" "\"
rustc = \"" rustc "/bin/rustc" "\"
docs = true
python = \"" python "/bin/python2" "\"
gdb = \"" gdb "/bin/gdb" "\"
vendor = true
submodules = false
[install]
prefix = \"" out "\"
docdir = \"" doc "/share/doc/rust" "\"
sysconfdir = \"etc\"
[rust]
default-linker = \"" gcc "/bin/gcc" "\"
channel = \"stable\"
rpath = true
" ;; There are 2 failed codegen tests:
;; codegen/mainsubprogram.rs and codegen/mainsubprogramstart.rs
;; These tests require a patched LLVM
"codegen-tests = false
[target." ,(nix-system->gnu-triplet-for-rust) "]
llvm-config = \"" llvm "/bin/llvm-config" "\"
cc = \"" gcc "/bin/gcc" "\"
cxx = \"" gcc "/bin/g++" "\"
ar = \"" binutils "/bin/ar" "\"
jemalloc = \"" jemalloc "/lib/libjemalloc_pic.a" "\"
[dist]
") port)))
                   #t)))
             (add-after 'configure 'provide-cc
               (lambda* (#:key inputs #:allow-other-keys)
                 (symlink (string-append (assoc-ref inputs "gcc") "/bin/gcc")
                          "/tmp/cc")
                 (setenv "PATH" (string-append "/tmp:" (getenv "PATH")))
                 #t))
             (add-after 'provide-cc 'configure-archiver
               (lambda* (#:key inputs #:allow-other-keys)
                 (substitute* "src/build_helper/lib.rs"
                  ;; Make sure "ar" is always used as the archiver.
                  (("\"musl\"") "\"\"")
                  ;; Then substitute "ar" by our name.
                  (("\"ar\"") (string-append "\""
                               (assoc-ref inputs "binutils")
                               "/bin/ar\"")))
                 #t))
             (delete 'patch-cargo-tomls)
             (add-before 'build 'reset-timestamps-after-changes
               (lambda* _
                 (for-each
                  (lambda (filename)
                    ;; Rust 1.20.0 treats timestamp 0 as "file doesn't exist".
                    ;; Therefore, use timestamp 1.
                    (utime filename 1 1 1 1))
                  (find-files "." #:directories? #t))
                 #t))
             (replace 'build
               (lambda* _
                 (invoke "./x.py" "build")
                 (invoke "./x.py" "build" "src/tools/cargo")))
             (replace 'check
               (lambda* _
                 ;; Disable parallel execution to prevent EAGAIN errors when
                 ;; running tests.
                 (invoke "./x.py" "-j1" "test" "-vv")
                 (invoke "./x.py" "-j1" "test" "src/tools/cargo")
                 #t))
             (replace 'install
               (lambda* (#:key outputs #:allow-other-keys)
                 (invoke "./x.py" "install")
                 (substitute* "config.toml"
                   ;; replace prefix to specific output
                   (("prefix = \"[^\"]*\"")
                    (string-append "prefix = \"" (assoc-ref outputs "cargo") "\"")))
                 (invoke "./x.py" "install" "cargo")))
             (add-after 'install 'delete-install-logs
               (lambda* (#:key outputs #:allow-other-keys)
                 (define (delete-manifest-file out-path file)
                   (delete-file (string-append out-path "/lib/rustlib/" file)))

                 (let ((out (assoc-ref outputs "out"))
                       (cargo-out (assoc-ref outputs "cargo")))
                   (for-each
                     (lambda (file) (delete-manifest-file out file))
                     '("install.log"
                       "manifest-rust-docs"
                       "manifest-rust-std-x86_64-unknown-linux-gnu"
                       "manifest-rustc"))
                   (for-each
                     (lambda (file) (delete-manifest-file cargo-out file))
                     '("install.log"
                       "manifest-cargo"))
                   #t)))
             (add-after 'install 'wrap-rustc
               (lambda* (#:key inputs outputs #:allow-other-keys)
                 (let ((out (assoc-ref outputs "out"))
                       (libc (assoc-ref inputs "libc"))
                       (ld-wrapper (assoc-ref inputs "ld-wrapper")))
                   ;; Let gcc find ld and libc startup files.
                   (wrap-program (string-append out "/bin/rustc")
                     `("PATH" ":" prefix (,(string-append ld-wrapper "/bin")))
                     `("LIBRARY_PATH" ":" suffix (,(string-append libc "/lib"))))
                   #t))))))))))

(define-public rust-1.21
  (let ((base-rust (rust-bootstrapped-package rust-1.20 "1.21.0"
                    "1yj8lnxybjrybp00fqhxw8fpr641dh8wcn9mk44xjnsb4i1c21qp")))
    (package
      (inherit base-rust)
      (arguments
       (substitute-keyword-arguments (package-arguments base-rust)
         ((#:phases phases)
          `(modify-phases ,phases
             (add-after 'configure 'remove-ar
               (lambda* (#:key inputs #:allow-other-keys)
                 ;; Remove because toml complains about "unknown field".
                 (substitute* "config.toml"
                  (("^ar =.*") "\n"))
                 #t)))))))))

(define-public rust-1.22
  (let ((base-rust (rust-bootstrapped-package rust-1.21 "1.22.1"
                    "1lrzzp0nh7s61wgfs2h6ilaqi6iq89f1pd1yaf65l87bssyl4ylb")))
    (package
      (inherit base-rust)
      (arguments
       (substitute-keyword-arguments (package-arguments base-rust)
         ((#:phases phases)
          `(modify-phases ,phases
             (add-after 'unpack 'remove-flaky-test
               (lambda _
                 ;; See <https://github.com/rust-lang/rust/issues/43402>.
                 (when (file-exists? "src/test/run-make/issue-26092")
                   (delete-file-recursively "src/test/run-make/issue-26092"))
                 #t)))))))))

(define-public rust-1.23
  (let ((base-rust (rust-bootstrapped-package rust-1.22 "1.23.0"
                    "14fb8vhjzsxlbi6yrn1r6fl5dlbdd1m92dn5zj5gmzfwf4w9ar3l")))
    (package
      (inherit base-rust)
      (arguments
       (substitute-keyword-arguments (package-arguments base-rust)
         ((#:phases phases)
          `(modify-phases ,phases
             (delete 'configure-archiver)
             (delete 'remove-ar)
             (add-after 'unpack 'dont-build-native
               (lambda _
                 ;; XXX: Revisit this when we use gcc 6.
                 (substitute* "src/binaryen/CMakeLists.txt"
                  (("ADD_COMPILE_FLAG\\(\\\"-march=native\\\"\\)") ""))
                 #t)))))))))

(define-public rust-1.24
  (let ((base-rust
         (rust-bootstrapped-package rust-1.23 "1.24.1"
          "1vv10x2h9kq7fxh2v01damdq8pvlp5acyh1kzcda9sfjx12kv99y")))
    (package
      (inherit base-rust)
      (arguments
       (substitute-keyword-arguments (package-arguments base-rust)
         ((#:phases phases)
          `(modify-phases ,phases
             (delete 'use-readelf-for-tests)
             (replace 'patch-aarch64-test
               (lambda* _
                 (substitute* "src/librustc_metadata/dynamic_lib.rs"
                   ;; This test is known to fail on aarch64 and powerpc64le:
                   ;; https://github.com/rust-lang/rust/issues/45410
                   (("fn test_loading_cosine") "#[ignore]\nfn test_loading_cosine"))
                 #t)))))))))

;;; Rust 1.25 release support work with llvm 6--but build with llvm 6 is
;;; not determenistic due to <https://github.com/rust-lang/rust/issues/50556>.
;;; Keep using llvm 3.9.1 until builds become determenistic
(define-public rust-1.25
  (let ((base-rust
         (rust-bootstrapped-package rust-1.24 "1.25.0"
          "0baxjr99311lvwdq0s38bipbnj72pn6fgbk6lcq7j555xq53mxpf")))
    (package
      (inherit base-rust)
      (source
        (origin
          (inherit (package-source base-rust))
          (snippet '(begin
                      (delete-file-recursively "src/jemalloc")
                      (delete-file-recursively "src/llvm")
                      (delete-file-recursively "src/llvm-emscripten")
                      #t))
          (patches (search-patches
                     "rust-1.25-accept-more-detailed-gdb-lines.patch"))))
      (arguments
       (substitute-keyword-arguments (package-arguments base-rust)
         ((#:phases phases)
          `(modify-phases ,phases
             (add-after 'patch-cargo-tests 'patch-cargo-index-update
               (lambda _
                 (substitute* "src/tools/cargo/tests/generate-lockfile.rs"
                   ;; This test wants to update the crate index.
                   (("fn no_index_update") "#[ignore]\nfn no_index_update"))
                 #t))
             (replace 'patch-aarch64-test
               (lambda _
                 (substitute* "src/librustc_metadata/dynamic_lib.rs"
                   ;; This test is known to fail on aarch64 and powerpc64le:
                   ;; https://github.com/rust-lang/rust/issues/45410
                   (("fn test_loading_cosine") "#[ignore]\nfn test_loading_cosine"))
                 ;; This test fails on aarch64 with llvm@6.0:
                 ;; https://github.com/rust-lang/rust/issues/49807
                 ;; other possible solution:
                 ;; https://github.com/rust-lang/rust/pull/47688
                 (delete-file "src/test/debuginfo/by-value-self-argument-in-trait-impl.rs")
                 #t))
             (delete 'ignore-glibc-2.27-incompatible-test))))))))

(define-public rust-1.26
  (let ((base-rust
         (rust-bootstrapped-package rust-1.25 "1.26.2"
          "0047ais0fvmqvngqkdsxgrzhb0kljg8wy85b01kbbjc88hqcz7pv")))
    (package
      (inherit base-rust)
      (source
        (origin
          (inherit (package-source base-rust))
          (patches (search-patches
                     "rust-coresimd-doctest.patch"
                     "rust-1.25-accept-more-detailed-gdb-lines.patch"))))
      (arguments
       (substitute-keyword-arguments (package-arguments base-rust)
         ((#:phases phases)
          `(modify-phases ,phases
             ;; binaryen was replaced with LLD project from LLVM
             (delete 'dont-build-native)
             (replace 'check
               (lambda* _
                 ;; Enable parallel execution.
                 (let ((parallel-job-spec
                        (string-append "-j" (number->string
                                             (min 4
                                                  (parallel-job-count))))))
                   (invoke "./x.py" parallel-job-spec "test" "-vv")
                   (invoke "./x.py" parallel-job-spec "test"
                           "src/tools/cargo"))))
             (replace 'remove-unsupported-tests
               (lambda* _
                 ;; Our ld-wrapper cannot process non-UTF8 bytes in LIBRARY_PATH.
                 ;; <https://lists.gnu.org/archive/html/guix-devel/2017-06/msg00193.html>
                 (delete-file-recursively "src/test/run-make-fulldeps/linker-output-non-utf8")
                 #t))
             (replace 'patch-cargo-tests
               (lambda* _
                 (substitute* "src/tools/cargo/tests/testsuite/build.rs"
                   (("/usr/bin/env") (which "env"))
                   ;; Guix llvm is compiled without asmjs-unknown-emscripten.
                   (("fn wasm32_final_outputs") "#[ignore]\nfn wasm32_final_outputs"))
                 (substitute* "src/tools/cargo/tests/testsuite/death.rs"
                   ;; This is stuck when built in container.
                   (("fn ctrl_c_kills_everyone") "#[ignore]\nfn ctrl_c_kills_everyone"))
                 ;; Prints test output in the wrong order when built on
                 ;; i686-linux.
                 (substitute* "src/tools/cargo/tests/testsuite/test.rs"
                   (("fn cargo_test_env") "#[ignore]\nfn cargo_test_env"))

                 ;; Avoid dependency on "git".
                 (substitute* "src/tools/cargo/tests/testsuite/new.rs"
                   (("fn author_prefers_cargo") "#[ignore]\nfn author_prefers_cargo")
                   (("fn finds_author_git") "#[ignore]\nfn finds_author_git")
                   (("fn finds_local_author_git") "#[ignore]\nfn finds_local_author_git"))
                 #t))
             ;; TODO(rebuild-rust): Remove this phase in rust-1.28 when rebuilding.
             (add-after 'patch-cargo-tests 'disable-cargo-test-for-nightly-channel
               (lambda* _
                 ;; This test failed to work on "nightly" channel builds
                 ;; https://github.com/rust-lang/cargo/issues/5648
                 (substitute* "src/tools/cargo/tests/testsuite/resolve.rs"
                   (("fn test_resolving_minimum_version_with_transitive_deps")
                    "#[ignore]\nfn test_resolving_minimum_version_with_transitive_deps"))
                 #t))
             (replace 'patch-cargo-index-update
               (lambda* _
                 (substitute* "src/tools/cargo/tests/testsuite/generate_lockfile.rs"
                   ;; This test wants to update the crate index.
                   (("fn no_index_update") "#[ignore]\nfn no_index_update"))
                 #t)))))))))

(define-public rust-1.27
  (let ((base-rust
         (rust-bootstrapped-package rust-1.26 "1.27.2"
          "0pg1s37bhx9zqbynxyydq5j6q7kij9vxkcv8maz0m25prm88r0cs")))
    (package
      (inherit base-rust)
      (source
        (origin
          (inherit (package-source base-rust))
          (patches (search-patches "rust-coresimd-doctest.patch"
                                   "rust-bootstrap-stage0-test.patch"
                                   "rust-1.25-accept-more-detailed-gdb-lines.patch"
                                   "rust-reproducible-builds.patch"))))
      (native-inputs
       ;; FIXME: Rust 1.27 and some later versions require GDB 8.2 specifically.
       ;; See <https://bugs.gnu.org/37810>.
       (alist-replace "gdb" (list gdb-8.2)
                      (package-native-inputs base-rust)))
      (arguments
       (substitute-keyword-arguments (package-arguments base-rust)
         ((#:phases phases)
          `(modify-phases ,phases
             (add-before 'install 'mkdir-prefix-paths
               (lambda* (#:key outputs #:allow-other-keys)
                 ;; As result of https://github.com/rust-lang/rust/issues/36989
                 ;; `prefix' directory should exist before `install' call
                 (mkdir-p (assoc-ref outputs "out"))
                 (mkdir-p (assoc-ref outputs "cargo"))
                 #t))
             (add-after 'patch-cargo-tests 'disable-thinlto-test
               (lambda* _
                 ;; thinlto required llvm 6.0 for work
                 (substitute* "src/tools/cargo/tests/testsuite/path.rs"
                   (("fn thin_lto_works") "#[ignore]\nfn thin_lto_works"))
                 #t)))))))))

(define-public rust-1.28
  (let ((base-rust
         (rust-bootstrapped-package rust-1.27 "1.28.0"
          "11k4rn77bca2rikykkk9fmprrgjswd4x4kaq7fia08vgkir82nhx")))
    (package
      (inherit base-rust)
      (source
        (origin
          (inherit (package-source base-rust))
          (patches (search-patches "rust-coresimd-doctest.patch"
                                   "rust-bootstrap-stage0-test.patch"
                                   "rust-1.25-accept-more-detailed-gdb-lines.patch"
                                   "rust-reproducible-builds.patch"))))
      (inputs
       ;; Use LLVM 6.0
       (alist-replace "llvm" (list llvm-6)
                      (package-inputs base-rust)))
      (arguments
       (substitute-keyword-arguments (package-arguments base-rust)
         ((#:phases phases)
          `(modify-phases ,phases
             (add-after 'configure 'enable-codegen-tests
               ;; Codegen tests should pass with llvm 6, so enable them.
               (lambda* _
                 (substitute* "config.toml"
                   (("codegen-tests = false") ""))
                 #t))
             (add-after 'patch-tests 'disable-amd64-avx-test
               ;; That test would fail on x86_64 machines without avx.
               (lambda* _
                 (substitute* "src/test/run-pass/issue-44056.rs"
                   (("only-x86_64") "ignore-test"))
                 #t))
             ;; The thinlto test should pass with llvm 6.
             (delete 'disable-thinlto-test))))))))

(define-public rust-1.29
  (let ((base-rust
         (rust-bootstrapped-package rust-1.28 "1.29.2"
          "1jb787080z754caa2w3w1amsygs4qlzj9rs1vy64firfmabfg22h")))
    (package
      (inherit base-rust)
      (source
        (origin
          (inherit (package-source base-rust))
          (patches (search-patches "rust-1.25-accept-more-detailed-gdb-lines.patch"
                                   "rust-reproducible-builds.patch")))))))

(define-public rust-1.30
  (let ((base-rust
         (rust-bootstrapped-package rust-1.29 "1.30.1"
          "0aavdc1lqv0cjzbqwl5n59yd0bqdlhn0zas61ljf38yrvc18k8rn")))
    (package
      (inherit base-rust)
      (source
        (origin
          (inherit (package-source base-rust))
          (snippet '(begin
                      (delete-file-recursively "src/jemalloc")
                      (delete-file-recursively "src/llvm")
                      (delete-file-recursively "src/llvm-emscripten")
                      (delete-file-recursively "src/tools/clang")
                      (delete-file-recursively "src/tools/lldb")
                      #t))))
      (arguments
       (substitute-keyword-arguments (package-arguments base-rust)
         ((#:phases phases)
          `(modify-phases ,phases
             (add-after 'patch-cargo-tests 'patch-cargo-env-shebang
               (lambda* (#:key inputs #:allow-other-keys)
                 (let ((coreutils (assoc-ref inputs "coreutils")))
                   (substitute* "src/tools/cargo/tests/testsuite/fix.rs"
                     ;; Cargo has a test which explicitly sets a
                     ;; RUSTC_WRAPPER environment variable which points
                     ;; to /usr/bin/env. Since it's not a shebang, it
                     ;; needs to be manually patched
                     (("\"/usr/bin/env\"")
                      (string-append "\"" coreutils "/bin/env\"")))
                   #t)))
             (add-after 'patch-cargo-env-shebang 'ignore-cargo-package-tests
               (lambda* _
                 (substitute* "src/tools/cargo/tests/testsuite/package.rs"
                   ;; These tests largely check that cargo outputs warning/error
                   ;; messages as expected. It seems that cargo outputs an
                   ;; absolute path to something in the store instead of the
                   ;; expected relative path (e.g. `[..]`) so we'll ignore
                   ;; these for now
                   (("fn include") "#[ignore]\nfn include")
                   (("fn exclude") "#[ignore]\nfn exclude"))
                   #t))
             ;; The test has been moved elsewhere.
             (replace 'disable-amd64-avx-test
               (lambda _
                 (substitute* "src/test/ui/run-pass/issues/issue-44056.rs"
                  (("only-x86_64") "ignore-test"))
                  #t)))))))))

(define (patch-command-exec-tests-phase test-path)
  "The command-exec.rs test moves around between releases.  We need to apply
a Guix-specific patch to it for each release.  This function generates the phase
that applies said patch, parametrized by the test-path.  This is done this way
because the phase is more complex than the equivalents for other tests that
move around."
 `(lambda* (#:key inputs #:allow-other-keys)
    (let ((coreutils (assoc-ref inputs "coreutils")))
      (substitute* ,test-path
        ;; This test suite includes some tests that the stdlib's
        ;; `Command` execution properly handles situations where
        ;; the environment or PATH variable are empty, but this
        ;; fails since we don't have `echo` available in the usual
        ;; Linux directories.
        ;; NB: the leading space is so we don't fail a tidy check
        ;; for trailing whitespace, and the newlines are to ensure
        ;; we don't exceed the 100 chars tidy check as well
        ((" Command::new\\(\"echo\"\\)")
         (string-append "\nCommand::new(\"" coreutils "/bin/echo\")\n")))
      #t)))

(define-public rust-1.31
  (let ((base-rust
         (rust-bootstrapped-package rust-1.30 "1.31.1"
          "0sk84ff0cklybcp0jbbxcw7lk7mrm6kb6km5nzd6m64dy0igrlli")))
    (package
      (inherit base-rust)
      (arguments
       (substitute-keyword-arguments (package-arguments base-rust)
         ((#:phases phases)
          `(modify-phases ,phases
             (add-after 'patch-tests 'patch-command-exec-tests
               ,(patch-command-exec-tests-phase
                  "src/test/run-pass/command-exec.rs"))
             ;; The test has been moved elsewhere.
             (replace 'disable-amd64-avx-test
               (lambda _
                 (substitute* "src/test/ui/issues/issue-44056.rs"
                  (("only-x86_64") "ignore-test"))
                 #t))
             (add-after 'patch-tests 'patch-process-docs-rev-cmd
               (lambda* _
                 ;; Disable some doc tests which depend on the "rev" command
                 ;; https://github.com/rust-lang/rust/pull/58746
                 (substitute* "src/libstd/process.rs"
                   (("```rust") "```rust,no_run"))
                 #t)))))))))

(define-public rust-1.32
  (let ((base-rust
         (rust-bootstrapped-package rust-1.31 "1.32.0"
          "0ji2l9xv53y27xy72qagggvq47gayr5lcv2jwvmfirx029vlqnac")))
    (package
      (inherit base-rust)
      (source
        (origin
          (inherit (package-source base-rust))
          (snippet '(begin (delete-file-recursively "src/llvm")
                           (delete-file-recursively "src/llvm-emscripten")
                           (delete-file-recursively "src/tools/clang")
                           (delete-file-recursively "src/tools/lldb")
                           (delete-file-recursively "vendor/jemalloc-sys/jemalloc")
                           #t))
          (patches (search-patches "rust-reproducible-builds.patch"))
          ;; the vendor directory has moved to the root of
          ;; the tarball, so we have to strip an extra prefix
          (patch-flags '("-p2"))))
      (inputs
       ;; Downgrade to LLVM 6, all LTO tests appear to fail with LLVM 7.0.1
       (alist-replace "llvm" (list llvm-6)
                      (package-inputs base-rust)))
      (arguments
       (substitute-keyword-arguments (package-arguments base-rust)
         ((#:phases phases)
          `(modify-phases ,phases
             ;; Cargo.lock and the vendor/ directory have been moved to the
             ;; root of the rust tarball
             (replace 'patch-cargo-checksums
               (lambda* _
                 (use-modules (guix build cargo-utils))
                 (substitute* "Cargo.lock"
                   (("(\"checksum .* = )\".*\"" all name)
                    (string-append name "\"" ,%cargo-reference-hash "\"")))
                 (generate-all-checksums "vendor")
                 #t))
             (add-after 'enable-codegen-tests 'override-jemalloc
               (lambda* (#:key inputs #:allow-other-keys)
                 ;; The compiler is no longer directly built against jemalloc,
                 ;; but rather via the jemalloc-sys crate (which vendors the
                 ;; jemalloc source). To use jemalloc we must enable linking to
                 ;; it (otherwise it would use the system allocator), and set
                 ;; an environment variable pointing to the compiled jemalloc.
                 (substitute* "config.toml"
                   (("^jemalloc =.*$") "")
                   (("[[]rust[]]") "\n[rust]\njemalloc=true\n"))
                 (setenv "JEMALLOC_OVERRIDE" (string-append (assoc-ref inputs "jemalloc")
                                                            "/lib/libjemalloc_pic.a"))
                 #t))
             ;; Remove no longer relevant steps
             (delete 'remove-flaky-test)
             (delete 'patch-aarch64-test))))))))

(define-public rust-1.33
  (let ((base-rust
         (rust-bootstrapped-package rust-1.32 "1.33.0"
           "152x91mg7bz4ygligwjb05fgm1blwy2i70s2j03zc9jiwvbsh0as")))
    (package
      (inherit base-rust)
      (source
        (origin
          (inherit (package-source base-rust))
          (patches '())
          (patch-flags '("-p1"))))
      (inputs
       ;; Upgrade to jemalloc@5.1.0
       (alist-replace "jemalloc" (list jemalloc)
                      (package-inputs base-rust)))
      (arguments
       (substitute-keyword-arguments (package-arguments base-rust)
         ((#:phases phases)
          `(modify-phases ,phases
             (delete 'ignore-cargo-package-tests)
             (add-after 'configure 'configure-test-threads
               ;; Several rustc and cargo tests will fail if run on one core
               ;; https://github.com/rust-lang/rust/issues/59122
               ;; https://github.com/rust-lang/cargo/issues/6746
               ;; https://github.com/rust-lang/rust/issues/58907
               (lambda* (#:key inputs #:allow-other-keys)
                 (setenv "RUST_TEST_THREADS" "2")
                 #t)))))))))

(define-public rust-1.34
  (let ((base-rust
         (rust-bootstrapped-package rust-1.33 "1.34.1"
           "19s09k7y5j6g3y4d2rk6kg9pvq6ml94c49w6b72dmq8p9lk8bixh")))
    (package
      (inherit base-rust)
      (source
        (origin
          (inherit (package-source base-rust))
          (snippet '(begin
                      (delete-file-recursively "src/llvm-emscripten")
                      (delete-file-recursively "src/llvm-project")
                      (delete-file-recursively "vendor/jemalloc-sys/jemalloc")
                      #t)))))))

(define-public rust-1.35
  (let ((base-rust
         (rust-bootstrapped-package rust-1.34 "1.35.0"
           "0bbizy6b7002v1rdhrxrf5gijclbyizdhkglhp81ib3bf5x66kas")))
    (package
      (inherit base-rust)
      (inputs
       (alist-replace "llvm" (list llvm-8)
                      (package-inputs base-rust)))
      (arguments
       (substitute-keyword-arguments (package-arguments base-rust)
         ((#:phases phases)
          `(modify-phases ,phases
             ;; The tidy test includes a pass which ensures large binaries
             ;; don't accidentally get checked into the rust git repo.
             ;; Unfortunately the test assumes that git is always available,
             ;; so we'll comment out the invocation of this pass.
             (add-after 'configure 'disable-tidy-bins-check
               (lambda* _
                 (substitute* "src/tools/tidy/src/main.rs"
                   (("bins::check") "//bins::check"))
                 #t)))))))))

(define-public rust-1.36
  (let ((base-rust
         (rust-bootstrapped-package rust-1.35 "1.36.0"
           "06xv2p6zq03lidr0yaf029ii8wnjjqa894nkmrm6s0rx47by9i04")))
    (package
      (inherit base-rust)
      (arguments
       (substitute-keyword-arguments (package-arguments base-rust)
         ((#:phases phases)
          `(modify-phases ,phases
             (delete 'patch-process-docs-rev-cmd))))))))

(define-public rust-1.37
  (let ((base-rust
         (rust-bootstrapped-package rust-1.36 "1.37.0"
           "1hrqprybhkhs6d9b5pjskfnc5z9v2l2gync7nb39qjb5s0h703hj")))
    (package
      (inherit base-rust)
      (arguments
       (substitute-keyword-arguments (package-arguments base-rust)
         ((#:phases phases)
          `(modify-phases ,phases
             (add-before 'configure 'configure-cargo-home
               (lambda _
                 (let ((cargo-home (string-append (getcwd) "/.cargo")))
                   (mkdir-p cargo-home)
                   (setenv "CARGO_HOME" cargo-home)
                   #t))))))))))

;; TODO(rebuild-rust): Switch to LLVM 9 in 1.38 instead of 1.40.
(define-public rust-1.38
  (let ((base-rust
         (rust-bootstrapped-package rust-1.37 "1.38.0"
           "101dlpsfkq67p0hbwx4acqq6n90dj4bbprndizpgh1kigk566hk4")))
    (package
      (inherit base-rust)
      #;(inputs
        (alist-replace "llvm" (list llvm-9)
                       (package-inputs base-rust)))
      (arguments
       (substitute-keyword-arguments (package-arguments base-rust)
         ((#:phases phases)
          `(modify-phases ,phases
             (replace 'patch-command-exec-tests
               ,(patch-command-exec-tests-phase
                  "src/test/ui/command-exec.rs"))
             (add-after 'patch-tests 'patch-command-uid-gid-test
               (lambda _
                 (substitute* "src/test/ui/command-uid-gid.rs"
                   (("/bin/sh") (which "sh"))
                   (("ignore-sgx") "ignore-sgx\n// ignore-tidy-linelength"))
                 #t)))))))))

(define-public rust-1.39
  (let ((base-rust
         (rust-bootstrapped-package rust-1.38 "1.39.0"
           "0mwkc1bnil2cfyf6nglpvbn2y0zfbv44zfhsd5qg4c9rm6vgd8dl")))
    (package
      (inherit base-rust)
      (arguments
       (substitute-keyword-arguments (package-arguments base-rust)
         ((#:phases phases)
          `(modify-phases ,phases
             (replace 'patch-cargo-checksums
               ;; The Cargo.lock format changed.
               (lambda* _
                 (use-modules (guix build cargo-utils))
                 (substitute* "Cargo.lock"
                   (("(checksum = )\".*\"" all name)
                    (string-append name "\"" ,%cargo-reference-hash "\"")))
                 (generate-all-checksums "vendor")
                 #t)))))))))

(define-public rust-1.40
  (let ((base-rust
         (rust-bootstrapped-package rust-1.39 "1.40.0"
           "1ba9llwhqm49w7sz3z0gqscj039m53ky9wxzhaj11z6yg1ah15yx")))
    (package
      (inherit base-rust)
      (inputs
        (alist-replace "llvm" (list llvm-9)
                       (package-inputs base-rust)))
      (source
        (origin
          (inherit (package-source base-rust))
          ;; llvm-emscripten is no longer bundled, as that codegen backend
          ;; got removed.
          (snippet '(begin
                      (delete-file-recursively "src/llvm-project")
                      (delete-file-recursively "vendor/jemalloc-sys/jemalloc")
                      #t))))
      (arguments
       ;; Rust 1.40 does not ship rustc-internal libraries by default
       ;; (see rustc-dev-split). This means that librustc_driver.so is no
       ;; longer available in lib/rustlib/$target/lib, which is the directory
       ;; included in the runpath of librustc_codegen_llvm-llvm.so.
       ;; This is detected by our validate-runpath phase as an error, but it
       ;; is harmless as the codegen backend is loaded by librustc_driver.so
       ;; itself, which must at that point have been already loaded.
       ;; As such, we skip validating the runpath for Rust 1.40.
       ;; Rust 1.41 stopped putting the codegen backend in a separate library,
       ;; which makes this workaround only necessary for this release.
       (cons* #:validate-runpath? #f
         (substitute-keyword-arguments (package-arguments base-rust)
           ((#:phases phases)
            `(modify-phases ,phases
               ;; We often need to patch tests with various Guix-specific paths.
               ;; This often increases the line length and makes tidy, rustc's
               ;; style checker, complain. We could insert additional newlines
               ;; or add an "// ignore-tidy-linelength" comment, but as an
               ;; ignore comment must be used, both approaches are fragile due
               ;; to upstream formatting changes. As such, disable running the
               ;; linter during tests, since it's intended for rustc developers
               ;; anyway.
               ;;
               ;; TODO(rebuild-rust): This phase could be added earlier to
               ;; simplify a significant amount of code, but it would require
               ;; rebuilding the entire rusty universe.
               (add-after 'patch-tests 'neuter-tidy
                 (lambda _
                   (substitute* "src/bootstrap/builder.rs"
                     (("^.*::Tidy,") ""))
                   #t))
               ;; TODO(rebuild-rust): Adapt the find-files approach for
               ;; earlier testsuite patches.
               (replace 'patch-command-uid-gid-test
                 (lambda _
                   (match (find-files "src/test" "command-uid-gid\\.rs")
                     ((file)
                      (substitute* file
                        (("/bin/sh") (which "sh")))))
                   #t))
               (replace 'patch-command-exec-tests
                 ,(patch-command-exec-tests-phase
                    '(match (find-files "src/test" "command-exec\\.rs")
                       ((file) file))))
               ;; TODO(rebuild-rust): The test in question got fixed long ago.
               (delete 'disable-cargo-test-for-nightly-channel)
               ;; The test got removed in commit 000fe63b6fc57b09828930cacbab20c2ee6e6d15
               ;; "Remove painful test that is not pulling its weight"
               (delete 'remove-unsupported-tests)))))))))

(define-public rust-1.41
  (let ((base-rust
         (rust-bootstrapped-package rust-1.40 "1.41.1"
           "0ws5x0fxv57fyllsa6025h3q6j9v3m8nb3syl4x0hgkddq0kvj9q")))
    (package
      (inherit base-rust)
      (arguments
       (substitute-keyword-arguments (package-arguments base-rust)
         ((#:validate-runpath? _) #t))))))

(define-public rust-1.42
  (rust-bootstrapped-package rust-1.41 "1.42.0"
    "0x9lxs82may6c0iln0b908cxyn1cv7h03n5cmbx3j1bas4qzks6j"))

(define-public rust-1.43
  (rust-bootstrapped-package rust-1.42 "1.43.0"
    "18akhk0wz1my6y9vhardriy2ysc482z0fnjdcgs9gy59kmnarxkm"))

(define-public rust-1.44
  (rust-bootstrapped-package rust-1.43 "1.44.1"
    "0ww4z2v3gxgn3zddqzwqya1gln04p91ykbrflnpdbmcd575n8bky"))

(define-public rust-1.45
  (let ((base-rust
         (rust-bootstrapped-package rust-1.44 "1.45.2"
           "0273a1g3f59plyi1n0azf21qjzwml1yqdnj5z472crz37qggr8xp")))
    (package
      (inherit base-rust)
      (source
        (origin
          (inherit (package-source base-rust))
          (patches (search-patches "rust-1.45-linker-locale.patch"))))
      (inputs
        (alist-replace "llvm" (list llvm-10)
                       (package-inputs base-rust)))
      (arguments
        (substitute-keyword-arguments (package-arguments base-rust)
          ((#:phases phases)
           `(modify-phases ,phases
              ;; These tests make sure that the parser behaves properly when
              ;; a source file starts with a shebang. Unfortunately,
              ;; the patch-shebangs phase changes the meaning of these edge-cases.
              ;; We skip the test since it's drastically unlikely Guix's packaging
              ;; will introduce a bug here.
              (add-after 'patch-tests 'skip-shebang-tests
                (lambda _
                  (with-directory-excursion "src/test/ui/parser/shebang"
                    (delete-file "shebang-doc-comment.rs")
                    (delete-file "sneaky-attrib.rs")
                    #t)))
              ;; This test case synchronizes itself by starting a localhost TCP
              ;; server. This doesn't work as networking is not available.
              (add-after 'patch-tests 'skip-networking-test
                (lambda _
                  (substitute* "src/tools/cargo/tests/testsuite/freshness.rs"
                    (("fn linking_interrupted" all)
                     (string-append "#[ignore] " all)))
                 #t)))))))))

;; TODO(staging): Bump this variable to the latest packaged rust.
(define-public rust rust-1.39)