- update to 20230521:
* error.c, defs.h, reader.c:
allow @1 or $@ with a warning if no %locations was given
* reader.c: clear pointer in end_ainfo() after freeing it.
* reader.c: report errors in %define as "unexpected value"
add/use macros begin_ainfo() and end_ainfo() to reduce clutter
* defs.h, error.c: add function unexpected_value()
* add %nterm as an alias for %type, since bison made that confusion.
* reader.c:
ensure that filler_buf and prefix_buf are initialized for the special case
where they are empty (report by Martin Jansa, cf: 20230219)
* output.c:
make test-differences smaller when compiling with YY_NO_LEAKS by replacing
a blank line with the generated #define rather than adding 3 lines.
* reader.c:
correct a use-after-free in more_curly, which could occur if a %lex-param
or %parse-param was multi-line (Redhat #2183006).
* main.c: rename no_space() to on_error()
* error.c: rename no_space() to no_error(), handling any errno
* defs.h: rename no_space() to on_error()