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-rw-r--r--guix/gexp.scm16
1 files changed, 16 insertions, 0 deletions
diff --git a/guix/gexp.scm b/guix/gexp.scm
index de8b7bbb46..a2da72e76c 100644
--- a/guix/gexp.scm
+++ b/guix/gexp.scm
@@ -179,6 +179,15 @@ This is the declarative counterpart of the 'interned-file' monadic procedure."
(output gexp-input-output) ;string
(native? gexp-input-native?)) ;Boolean
+(define (write-gexp-input input port)
+ (match input
+ (($ <gexp-input> thing output #f)
+ (format port "#<gexp-input ~s:~a>" thing output))
+ (($ <gexp-input> thing output #t)
+ (format port "#<gexp-input native ~s:~a>" thing output))))
+
+(set-record-type-printer! <gexp-input> write-gexp-input)
+
(define* (gexp-input thing ;convenience procedure
#:optional (output "out")
#:key native?)
@@ -193,6 +202,13 @@ whether this should be considered a \"native\" input or not."
gexp-output?
(name gexp-output-name))
+(define (write-gexp-output output port)
+ (match output
+ (($ <gexp-output> name)
+ (format port "#<gexp-output ~a>" name))))
+
+(set-record-type-printer! <gexp-output> write-gexp-output)
+
(define raw-derivation
(store-lift derivation))