gexp: Correctly handle #$output in 'gexp->approximate-sexp'.

This addresses the following backtrace from
"guix lint -c wrapper-inputs hostapd":

Backtrace:ostapd@2.10 [wrapper-inputs]...
[...]
    174:9  3 (gexp->approximate-sexp #<gexp (modify-phases %standard?>)
In srfi/srfi-1.scm:
   586:17  2 (map1 (#<gexp-output out> #<gexp-input "pkg-config":o?>))
In guix/gexp.scm:
   175:16  1 (_ _)
In ice-9/boot-9.scm:
  1685:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1685:16: In procedure raise-exception:
Throw to key `match-error' with args `("match" "no matching pattern" #<gexp-output out>)'.

* guix/gexp.scm (gexp->approximate-sexp): Handle the case where 'reference' is
  a <gexp-output>,, by returning (*approximate*).
* tests/gexp.scm ("gexp->approximate-sexp, outputs"): Test it.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/tests/gexp.scm b/tests/gexp.scm
index 61ed5bc02d..c80ca13fab 100644
--- a/tests/gexp.scm
+++ b/tests/gexp.scm
@@ -148,6 +148,11 @@
          (null? (gexp-inputs exp))
          (gexp->sexp* exp))))
 
+(test-equal "gexp->approximate-sexp, outputs"
+  '(list 'out:foo (*approximate*) 'out:bar (*approximate*))
+  (gexp->approximate-sexp
+   #~(list 'out:foo #$output:foo 'out:bar #$output:bar)))
+
 (test-equal "unquote"
   '(display `(foo ,(+ 2 3)))
   (let ((exp (gexp (display `(foo ,(+ 2 3))))))