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-rw-r--r--guix/gexp.scm8
1 files changed, 8 insertions, 0 deletions
diff --git a/guix/gexp.scm b/guix/gexp.scm
index 770b79e012..f7def5862b 100644
--- a/guix/gexp.scm
+++ b/guix/gexp.scm
@@ -438,6 +438,14 @@ This is the declarative counterpart of 'gexp->file'."
(base file-append-base) ;<package> | <derivation> | ...
(suffix file-append-suffix)) ;list of strings
+(define (write-file-append file port)
+ (match file
+ (($ <file-append> base suffix)
+ (format port "#<file-append ~s ~s>" base
+ (string-join suffix)))))
+
+(set-record-type-printer! <file-append> write-file-append)
+
(define (file-append base . suffix)
"Return a <file-append> object that expands to the concatenation of BASE and
SUFFIX."