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ect'>packages: Remove duplicates from package cache.Ludovic Courtès Previously the same package could appear several times if several variables were bound to it, as is notably the case for "python" currently. This, in turn, would lead to obnoxious "ambiguous package specification" messages. * gnu/packages.scm (generate-package-cache)[expand-cache]: Change RESULT to RESULT+SEEN and adjust accordingly. Call 'first' on the result of 'fold-module-public-variables*'. * tests/packages.scm ("fold-available-packages with/without cache"): Check for lack of duplicates in FROM-CACHE. 2019-02-16environment: Add '--inherit'.Ludovic Courtès * guix/scripts/environment.scm (purify-environment): Add 'white-list' parameter and honor it. (create-environment): Add #:white-list parameter and honor it. (launch-environment): Likewise. (launch-environment/fork): Likewise. (show-help, %options): Add '--inherit'. (guix-environment): Define 'white-list' and pass it to 'launch-environment/fork'. * tests/guix-environment.sh: Test '--inherit'. * doc/guix.texi (Invoking guix environment): Document it. 2019-02-12inferior: Add 'inferior-available-packages'.Ludovic Courtès * guix/inferior.scm (inferior-available-packages): New procedure. * tests/inferior.scm ("inferior-available-packages"): New test.