records: Add MATCH-RECORD-LAMBDA.

* guix/records.scm (match-record-lambda): New syntax.
* tests/records.scm ("match-record-lambda"): New test.

Signed-off-by: Josselin Poiret <dev@jpoiret.xyz>

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/records.scm b/tests/records.scm
index 4f0aeb39035..8ee306bddc5 100644
--- a/tests/records.scm
+++ b/tests/records.scm
@@ -590,4 +590,16 @@ Description: 1st line,
       (match-record rec <with-thunked> (normal thunked)
         (list normal thunked)))))
 
+(test-equal "match-record-lambda"
+  '("thing: foo" "thing: bar")
+  (begin
+    (define-record-type* <with-text> with-text make-with-text
+      with-text?
+      (text with-text-text))
+
+    (map (match-record-lambda <with-text> (text)
+           (string-append "thing: " text))
+         (list (with-text (text "foo"))
+               (with-text (text "bar"))))))
+
 (test-end)