(Actions after errors): New test case.

tests/actions.at

@@ -82,6 +82,153 @@ AT_CLEANUP
 
 
 
+## ---------------------- ##
+## Actions after errors.  ##
+## ---------------------- ##
+
+AT_SETUP([Actions after errors])
+
+
+
+AT_DATA_GRAMMAR([[input.y]],
+[[%{
+#include <stdio.h>
+#include <stdlib.h>
+
+static int yylex (void);
+static void yyerror (char const *);
+
+#define YYDEBUG 1
+%}
+%union { int ival; }
+%type <ival> 'x' ';' thing line input
+
+%%
+input:
+  /* Nothing. */
+    {
+      $$ = 0;
+      printf ("input(%d): /* Nothing */\n", $$);
+    }
+| line input /* Right recursive to load the stack so that popping at
+		EOF can	be exercised.  */
+    {
+      $$ = 2;
+      printf ("input(%d): line(%d) input(%d)\n", $$, $1, $2);
+    }
+;
+
+line:
+  thing thing thing ';'
+    {
+      $$ = $1;
+      printf ("line(%d): thing(%d) thing(%d) thing(%d) ';'(%d)\n",
+	      $$, $1, $2, $3, $4);
+    }
+| thing thing ';'
+    {
+      $$ = $1;
+      printf ("line(%d): thing(%d) thing(%d) ';'(%d)\n", $$, $1, $2, $3);
+    }
+| thing ';'
+    {
+      $$ = $1;
+      printf ("line(%d): thing(%d) ';'(%d)\n", $$, $1, $2);
+    }
+| error ';'
+    {
+      $$ = -1;
+      printf ("line(%d): error ';'(%d)\n", $$, $2);
+    }
+;
+
+thing:
+  'x'
+    {
+      $$ = $1;
+      printf ("thing(%d): 'x'(%d)\n", $$, $1);
+    }
+;
+%%
+static size_t counter;
+
+static int
+yylex (void)
+{
+  static char const input[] =
+    {
+      /* Exericise the discarding of stack top and input until `error'
+         can be reduced.  */
+      'x', 'x', 'x', 'x', 'x', 'x', ';',
+
+      /* Load the stack and provoke an error that cannot be caught by
+         the grammar, to check that the stack is cleared. */
+      'x', 'x', ';',
+      'x', ';',
+      'y'
+    };
+
+  if (counter < sizeof input)
+    {
+       yylval.ival = counter;
+       printf ("sending: '%c' (value = %d)\n", input[counter], yylval.ival);
+       return input[counter++];
+    }
+  else
+    {
+      printf ("sending: EOF\n");
+      return EOF;
+    }
+}
+
+static void
+yyerror (char const *msg)
+{
+  printf ("%lu: %s\n", (unsigned long int) counter, msg);
+}
+
+int
+main (void)
+{
+  yydebug = !!getenv ("YYDEBUG");
+  return yyparse ();
+}
+]])
+
+AT_CHECK([bison -o input.c input.y])
+AT_COMPILE([input])
+AT_PARSER_CHECK([./input], 1,
+[[sending: 'x' (value = 0)
+thing(0): 'x'(0)
+sending: 'x' (value = 1)
+thing(1): 'x'(1)
+sending: 'x' (value = 2)
+thing(2): 'x'(2)
+sending: 'x' (value = 3)
+4: syntax error
+sending: 'x' (value = 4)
+sending: 'x' (value = 5)
+sending: ';' (value = 6)
+line(-1): error ';'(6)
+sending: 'x' (value = 7)
+thing(7): 'x'(7)
+sending: 'x' (value = 8)
+thing(8): 'x'(8)
+sending: ';' (value = 9)
+line(7): thing(7) thing(8) ';'(9)
+sending: 'x' (value = 10)
+thing(10): 'x'(10)
+sending: ';' (value = 11)
+line(10): thing(10) ';'(11)
+sending: 'y' (value = 12)
+13: syntax error
+sending: EOF
+]])
+
+AT_CLEANUP
+
+
+
 ## ---------------- ##
 ## Exotic Dollars.  ##
 ## ---------------- ##