[PATCH v9 03/18] r7rs-libraries: Add support for 'else' clause in cond-expand.

[Maxim Cournoyer]

* module/ice-9/r7rs-libraries.scm (define-library)
<handle-cond-expand>: Add a pattern to match an 'else' clause.
---

(no changes since v1)

 module/ice-9/r7rs-libraries.scm | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/module/ice-9/r7rs-libraries.scm b/module/ice-9/r7rs-libraries.scm
index 429d82ad9..97465b649 100644
--- a/module/ice-9/r7rs-libraries.scm
+++ b/module/ice-9/r7rs-libraries.scm
@@ -64,8 +64,10 @@
            ;; FIXME: R7RS (features) isn't quite the same as
            ;; %cond-expand-features; see scheme/base.scm.
            (memq (syntax->datum #'id) %cond-expand-features))))
-      (syntax-case clauses ()
+      (syntax-case clauses (else)
         (() #'())  ; R7RS says this is not specified :-/
+        (((else decl ...))
+         #'(decl ...))
         (((test decl ...) . clauses)
          (if (has-req? #'test)
              #'(decl ...)
-- 
2.41.0