Replace int with mrb_bool in local_var_p func
Replace int with mrb_bool in parse_string func
Fix indent
Merge pull request #2622 from suzukaze/fix-local_var_p

Replace int with mrb_bool in local_var_p func
Merge pull request #2621 from suzukaze/fix-parse_string

Replace int with mrb_bool in parse_string func
Merge pull request #2623 from suzukaze/fix-indent

Fix indent
Refactor for_body func