bison: catch bad symbol names.

* src/scan-gram.l({int}{id}): Report as an invalid identifier.
	* tests/input.at: Adjust.

ChangeLog

@@ -1,3 +1,9 @@
+2009-05-04  Akim Demaille  <demaille@gostai.com>
+
+	bison: catch bad symbol names.
+	* src/scan-gram.l({int}{id}): Report as an invalid identifier.
+	* tests/input.at: Adjust.
+
 2009-05-04  Akim Demaille  <demaille@gostai.com>
 
 	space changes.

src/scan-gram.l

@@ -208,6 +208,12 @@ splice	 (\\[ \f\t\v]*\n)*
     complain_at (*loc, _("invalid directive: %s"), quote (yytext));
   }
 
+  /* Identifiers may not start with a digit.  Yet, don't silently
+     accept "1FOO" as "1 FOO".  */
+  {int}{id} {
+    complain_at (*loc, _("invalid identifier: %s"), quote (yytext));
+  }
+
   "="                     return EQUAL;
   "|"                     return PIPE;
   ";"                     return SEMICOLON;

tests/input.at

@@ -662,13 +662,13 @@ AT_COMPILE([input.o], [-c input.c])
 # Digits cannot.
 AT_DATA_GRAMMAR([input.y],
 [[%token .GOOD
-%token -GOOD
-%token 1NV4L1D
+         -GOOD
+         1NV4L1D
 %%
 start: .GOOD -GOOD
 ]])
 AT_BISON_CHECK([-o input.c input.y], [1], [],
-[[input.y:11.8: syntax error, unexpected integer, expecting char or identifier or type
+[[input.y:11.10-16: invalid identifier: `1NV4L1D'
 ]])
 
 AT_CLEANUP