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-rw-r--r--guix/gexp.scm33
1 files changed, 18 insertions, 15 deletions
diff --git a/guix/gexp.scm b/guix/gexp.scm
index 80d8f735b3..d9c4cb461e 100644
--- a/guix/gexp.scm
+++ b/guix/gexp.scm
@@ -459,21 +459,24 @@ whether this should be considered a \"native\" input or not."
(set-record-type-printer! <gexp-output> write-gexp-output)
(define (gexp-modules gexp)
- "Return the list of Guile module names GEXP relies on."
- (delete-duplicates
- (append (gexp-self-modules gexp)
- (append-map (match-lambda
- (($ <gexp-input> (? gexp? exp))
- (gexp-modules exp))
- (($ <gexp-input> (lst ...))
- (append-map (lambda (item)
- (if (gexp? item)
- (gexp-modules item)
- '()))
- lst))
- (_
- '()))
- (gexp-references gexp)))))
+ "Return the list of Guile module names GEXP relies on. If (gexp? GEXP) is
+false, meaning that GEXP is a plain Scheme object, return the empty list."
+ (if (gexp? gexp)
+ (delete-duplicates
+ (append (gexp-self-modules gexp)
+ (append-map (match-lambda
+ (($ <gexp-input> (? gexp? exp))
+ (gexp-modules exp))
+ (($ <gexp-input> (lst ...))
+ (append-map (lambda (item)
+ (if (gexp? item)
+ (gexp-modules item)
+ '()))
+ lst))
+ (_
+ '()))
+ (gexp-references gexp))))
+ '())) ;plain Scheme data type
(define* (lower-inputs inputs
#:key system target)