1 files changed, 75 insertions, 0 deletions
diff --git a/gnu/packages/patches/emacs-haskell-mode-no-redefine-builtin.patch b/gnu/packages/patches/emacs-haskell-mode-no-redefine-builtin.patch
new file mode 100644
index 0000000000..65ace2ee5e
--- /dev/null
+++ b/gnu/packages/patches/emacs-haskell-mode-no-redefine-builtin.patch
@@ -0,0 +1,75 @@
+From faa95a784d2c74c72e70367a5d531df6dd61aeab Mon Sep 17 00:00:00 2001
+From: Steve Purcell <steve@sanityinc.com>
+Date: Sun, 6 Aug 2023 16:41:48 +0200
+Subject: [PATCH] Don't redefine built-in function
+
+Fixes #1817
+---
+ tests/haskell-indent-tests.el      | 14 ++++++++------
+ tests/haskell-indentation-tests.el | 14 ++++++++------
+ 2 files changed, 16 insertions(+), 12 deletions(-)
+
+diff --git a/tests/haskell-indent-tests.el b/tests/haskell-indent-tests.el
+index 7196405b8..9a3de4ad3 100644
+--- a/tests/haskell-indent-tests.el
++++ b/tests/haskell-indent-tests.el
+@@ -40,11 +40,13 @@
+ ;;                    (haskell-indent-put-region-in-literate (point-min) (point-max) -1)
+ ;;                    (buffer-substring-no-properties (point-min) (point-max))))))
+ 
+-(defsubst string-trim-left (string)
+-  "Remove leading whitespace from STRING."
+-  (if (string-match "\\`[ \t\n\r]+" string)
+-      (replace-match "" t t string)
+-    string))
++(if (fboundp 'string-trim-left)
++    (defalias 'haskell--string-trim-left 'string-trim-left)
++  (defun haskell--string-trim-left (string &optional regexp)
++    "Remove leading whitespace from STRING."
++    (if (string-match (concat "\\`\\(?:" (or regexp "[ \t\n\r]+") "\\)") string)
++        (substring string (match-end 0))
++      string)))
+ 
+ (defun haskell-indent-format-info (info)
+   (if (cdr info)
+@@ -128,7 +130,7 @@ macro quotes them for you."
+          :expected-result
+          ,(if allow-failure :failed :passed)
+          (haskell-indent-check
+-          ,(string-trim-left source)
++          ,(haskell--string-trim-left source)
+           ,@(mapcar (lambda (x)
+                       (list 'quote x))
+                     test-cases))))))
+diff --git a/tests/haskell-indentation-tests.el b/tests/haskell-indentation-tests.el
+index 4889b76a7..cd783a4f4 100644
+--- a/tests/haskell-indentation-tests.el
++++ b/tests/haskell-indentation-tests.el
+@@ -33,11 +33,13 @@
+ 
+ ;;; Code:
+ 
+-(defsubst string-trim-left (string)
+-  "Remove leading whitespace from STRING."
+-  (if (string-match "\\`[ \t\n\r]+" string)
+-      (replace-match "" t t string)
+-    string))
++(if (fboundp 'string-trim-left)
++    (defalias 'haskell--string-trim-left 'string-trim-left)
++  (defun haskell--string-trim-left (string &optional regexp)
++    "Remove leading whitespace from STRING."
++    (if (string-match (concat "\\`\\(?:" (or regexp "[ \t\n\r]+") "\\)") string)
++        (substring string (match-end 0))
++      string)))
+ 
+ (defun haskell-indentation-check (source &rest test-cases)
+   "Check if `haskell-indentation-find-indentations' returns expected results.
+@@ -115,7 +117,7 @@ macro quotes them for you."
+          :expected-result
+          ,(if allow-failure :failed :passed)
+          (haskell-indentation-check
+-          ,(string-trim-left source)
++          ,(haskell--string-trim-left source)
+           ,@(mapcar (lambda (x)
+                       (list 'quote x))
+                     test-cases))))))