Some code and documentation improvements.

[bison.git] / data / lalr1.cc

diff --git a/data/lalr1.cc b/data/lalr1.cc
index 342d87cfd65d900d77fbd4ad4c625da438be3f9f..3a15012a004b401a57fc2f3902fe2351e123c17c 100644 (file)
--- a/data/lalr1.cc
+++ b/data/lalr1.cc
@@ -841,7 +841,8 @@ b4_error_verbose_if([, int tok])[)
     if (yypact_ninf_ < yyn && yyn <= yylast_)
       {
        /* Start YYX at -YYN if negative to avoid negative indexes in
-          YYCHECK.  */
+          YYCHECK.  In other words, skip the first -YYN actions for this
+          state because they are default actions.  */
        int yyxbegin = yyn < 0 ? -yyn : 0;
 
        /* Stay within bounds of both yycheck and yytname.  */