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build: go-build-system: Use WHEN for side-effect conditionals.
* guix/build/go-build-system.scm (unpack): Replace single branch `if' by `when'.
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@ -158,6 +158,10 @@ (define* (unpack #:key source import-path unpack-path #:allow-other-keys)
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((display "WARNING: The Go import path is unset.\n")))
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((display "WARNING: The Go import path is unset.\n")))
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(if (string-null? unpack-path)
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(if (string-null? unpack-path)
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(set! unpack-path import-path))
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(set! unpack-path import-path))
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(when (string-null? import-path)
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((display "WARNING: The Go import path is unset.\n")))
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(when (string-null? unpack-path)
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(set! unpack-path import-path))
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(let ((dest (string-append (getenv "GOPATH") "/src/" unpack-path)))
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(let ((dest (string-append (getenv "GOPATH") "/src/" unpack-path)))
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(mkdir-p dest)
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(mkdir-p dest)
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(if (file-is-directory? source)
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(if (file-is-directory? source)
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