Ordinarily Bison puts them in the parser file so that the C compiler
and debuggers will associate errors with your source file, the
grammar file. This option causes them to associate errors with the
-parser file, treating it an independent source file in its own right.
+parser file, treating it as an independent source file in its own right.
@item -o @var{outfile}
@itemx --output-file=@var{outfile}