In the grammar file, the first column is 1 not 0 on the first line as

on every other line.
* src/parse-gram.y (%initial-action): Initialize @$ correctly.
* tests/input.at (Torturing the Scanner): Update output.

* src/scan-gram.l (scanner_cursor): Declare it static.

src/scan-gram.l

@@ -54,7 +54,7 @@
    code_start = scanner_cursor = loc->start;		\
 
 /* Location of scanner cursor.  */
-boundary scanner_cursor;
+static boundary scanner_cursor;
 
 #define YY_USER_ACTION  location_compute (loc, &scanner_cursor, yytext, yyleng);