message: Fix by patching in generate_grammar.py
diff: @@ -267,6 +267,7 @@ with open_utf8(target_source_loc, 'r') as f:
  text = f.read()
  text = text.replace('#include "grammar_out.hpp"', '#include "include/parser/gram.hpp"')
  +text = text.replace('yynerrs = 0;', 'yynerrs = 0; (void)yynerrs;')
  with open_utf8(target_source_loc, 'w+') as f:
  f.write(text)
  \ No newline at end of file
  