[Guile-commits] GNU Guile branch, stable-2.0, updated. v2.0.3-152-gc5f6c2e

[Mark H Weaver]

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- Log -----------------------------------------------------------------
commit c5f6c2e47fab220fd090d911efc2a71a563b7c1d
Author: Mark H Weaver <address@hidden>
Date:   Sat Jan 14 04:28:16 2012 -0500

    Don't diverge when serializing cyclic lists during compilation
    
    * module/language/glil/compile-assembly.scm (scheme-list?): Don't
      diverge when serializing cyclic lists.

-----------------------------------------------------------------------

Summary of changes:
 module/language/glil/compile-assembly.scm |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/module/language/glil/compile-assembly.scm 
b/module/language/glil/compile-assembly.scm
index 997f7c7..a51fd58 100644
--- a/module/language/glil/compile-assembly.scm
+++ b/module/language/glil/compile-assembly.scm
@@ -106,9 +106,11 @@
 ;; This tests for a proper scheme list whose last cdr is '(), not #nil.
 ;;
 (define (scheme-list? x)
-  (or (eq? x '())
-      (and (pair? x)
-           (scheme-list? (cdr x)))))
+  (and (list? x)
+       (or (eq? x '())
+           (let ((p (last-pair x)))
+             (and (pair? p)
+                  (eq? (cdr p) '()))))))
 
 ;; Note: in all of these procedures that build up constant tables, the
 ;; first (zeroth) index is reserved.  At runtime it is replaced with the


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