bison: catch bad symbol names.

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

ChangeLog

@@ -1,8 +1,14 @@
+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>
 
 	identifiers: dashes are letters.
 	Dashes can now start identifiers (symbols and directives).
-	
+
 	* src/scan-gram.l ({letter}): Add dash.
 	({id}): Remove it.
 	* tests/input.at (Symbols): Adjust.

src/scan-gram.l

@@ -240,6 +240,12 @@ splice	 (\\[ \f\t\v]*\n)*
     return INT;
   }
 
+  /* 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));
+  }
+
   /* Characters.  We don't check there is only one.  */
   "'"	      STRING_GROW; token_start = loc->start; BEGIN SC_ESCAPED_CHARACTER;
 

tests/input.at

@@ -657,13 +657,13 @@ 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 <tag>
+[[input.y:11.10-16: invalid identifier: `1NV4L1D'
 ]])
 
 AT_CLEANUP