ccwl: Set default value of lambda** n-ary arguments to '().

* ccwl/utils.scm (lambda**): Set default value of lambda** n-ary
arguments to the empty list. Document this in the docstring.
* tests/utils.scm ("default value of lambda** unary argument should be
#f", "default value of lambda** n-ary argument should be the empty
list"): New tests.

1 files changed, 10 insertions, 0 deletions

diff --git a/tests/utils.scm b/tests/utils.scm
index 5c5bfd1..bc9315d 100644
--- a/tests/utils.scm
+++ b/tests/utils.scm
@@ -70,6 +70,16 @@
      (list foo aal vale pal naal irandu sol))
    1 2 #:vale 123 #:naal 321 456))
 
+(test-equal "default value of lambda** unary argument should be #f"
+  #f
+  ((lambda** (#:key foo)
+     foo)))
+
+(test-equal "default value of lambda** n-ary argument should be the empty list"
+  '()
+  ((lambda** (#:key* foo)
+     foo)))
+
 (test-assert "syntax-lambda**"
   (equal? (list #'1 #'2 #'123 (list #'1 #'2 #'3))
           ((syntax-lambda** (a b #:key foo #:key* bar)