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diff --git a/tests/bison_nr_parser.y b/tests/bison_nr_parser.y
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+/*
+ * This file is part of flex.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 
+ * Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE.
+ */
+
+/* 
+   How to compile:
+   bison --defines --output-file="parser.c" --name-prefix="test" parser.y
+ */
+%{
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "config.h"
+#include "bison_nr_parser.h"
+#include "bison_nr_scanner.h"
+
+#define YYERROR_VERBOSE 1
+/* #define YYPARSE_PARAM scanner */
+/* #define YYLEX_PARAM   scanner */
+
+int yyerror(const char* msg);
+
+
+/* A dummy function. A check against seg-faults in yylval->str. */
+static int process_text(char* s) {
+    int total =0;
+    while(*s) {
+        total += (int) *s;
+        ++s;
+    }
+    return total;
+}
+
+
+%}
+
+%pure-parser
+
+%union  {
+    int  lineno;
+    char * str;
+}
+%token <str> IDENT
+%token <lineno> LINENO
+%token  EQUAL "="
+%token  COLON ":"
+%token  SPACE " "
+%%
+
+file:
+     line
+  |  file line
+  ;
+
+line:
+    LINENO COLON SPACE IDENT EQUAL IDENT
+    {
+        process_text($4);
+        process_text($6);
+        /* Check lineno. */
+        if( $1 != @1.first_line || $1 != testget_lineno())
+        {
+            yyerror("Parse failed: Line numbers do not match.");
+            YYABORT;
+        }
+
+        /* Recreate the line to stdout. */
+        printf ( "%04d: %s=%s\n", @1.first_line, $4, $6);
+    }
+    ;
+
+%%
+
+int yyerror(const char* msg) {
+    fprintf(stderr,"%s\n",msg);
+    return 0;
+}
+