* src/main.c (main): Free `infile'.

* src/scan-gram.l (handle_syncline): New.
Recognize `#line'.
* src/output.c (user_actions_output, symbol_destructors_output)
(symbol_printers_output): Use the location's file name, not
infile.
* src/reader.c (prologue_augment, epilogue_set): Likewise.

src/getargs.c

@@ -419,5 +419,5 @@ getargs (int argc, char *argv[])
       usage (EXIT_FAILURE);
     }
 
-  infile = argv[optind];
+  infile = xstrdup (argv[optind]);
 }