This patch enables character literals as terminals in a LALR grammar.
It is safe to apply on Chicken because eq? can be used to compare characters.
(Otherwise, memq needs to be changed to memv, etc. in lalr-driver.scm.)

Patch not applied at this time.

-- zbigniew

Index: lalr-driver.scm
===================================================================
--- lalr-driver.scm	(revision 21903)
+++ lalr-driver.scm	(working copy)
@@ -124,7 +124,8 @@
                  (attr  (___value ___input))
                  (act   (___action i (vector-ref ___atable state))))
             
-            (cond ((not (symbol? i))
+            (cond ((and (not (symbol? i))
+                        (not (char? i)))
                    (___errorp "Syntax error: invalid token: " ___input)
                    #f)

Index: lalr.scm
===================================================================
--- lalr.scm	(revision 21903)
+++ lalr.scm	(working copy)
@@ -1311,7 +1311,9 @@
   (symbol? x))
 
 (define (valid-terminal? x)
-  (symbol? x))			; DB 
+  (or (symbol? x)
+      (char? x))
+  )			; DB 
 
 ;; ----------------------------------------------------------------------
 ;; Miscellaneous