H' hex constants

[DJ Delorie]

> > It doesn't gracefully handle syntax errors though (bad),
> > but I suspect it's no worse than the surprise the user gets when they
> > use H'00 without this patch.  Perhaps an additional warning for single
> > quotes following symbol chars would be useful?
> 
> Yes that might be helpful.

Something like this?  No command line option to silence it, but anyone
doing foo'5 should be warned about it ;-)


@@ -1009,6 +1024,14 @@ do_scrub_chars (int (*get) (char *, int)
 
 #ifndef IEEE_STYLE
        case LEX_IS_ONECHAR_QUOTE:
+         if (state == 9)
+           {
+             char c;
+
+             c = GET ();
+             as_warn ("'%c found after symbol", c);
+             UNGET (c);
+           }
          if (state == 10)
            {
              /* Preserve the whitespace in foo 'b'.  */