(yyreturn): Don't pop stack if yyinitStateSet failed,

as the stack isn't valid in that case.

diff --git a/data/glr.c b/data/glr.c
index 578ad11..219dd3f 100644 (file)
--- a/data/glr.c
+++ b/data/glr.c
@@ -2107,17 +2107,21 @@ b4_syncline([@oline@], [@ofile@])])dnl
                 yytoken, yylvalp]b4_location_if([, yyllocp])[);
 
   /* Now pop stack until empty, destroying its entries as we go.  */
-  while (yystack.yytops.yystates[0] != NULL)
-    {
-      yyGLRState *yys = yystack.yytops.yystates[0];
-]b4_location_if([[      yystack.yyerror_range[1].yystate.yyloc = yys->yyloc;]])[
-      yydestruct ("Error: popping",
-                 yystos[yys->yylrState],
-                 &yys->yysemantics.yysval]b4_location_if([, &yys->yyloc])[);
-      yystack.yytops.yystates[0] = yys->yypred;
-      yystack.yynextFree -= 1;
-      yystack.yyspaceLeft += 1;
-    }
+  {
+    yyGLRState** yystates = yystack.yytops.yystates;
+    if (yystates)
+      while (yystates[0])
+       {
+         yyGLRState *yys = yystates[0];
+]b4_location_if([[       yystack.yyerror_range[1].yystate.yyloc = yys->yyloc;]]
+)[       yydestruct ("Error: popping",
+                     yystos[yys->yylrState],
+                     &yys->yysemantics.yysval]b4_location_if([, &yys->yyloc])[);
+         yystates[0] = yys->yypred;
+         yystack.yynextFree -= 1;
+         yystack.yyspaceLeft += 1;
+       }
+  }
 
   yyfreeGLRStack (&yystack);
   return yyresult;