Yuichiro Kaneko

Support `expect!` declaration in Racc grammar file

1

`expect` warns the difference between expected S/R conflicts count and actual count however racc command exits with success. racc command will exit with failure if `expect!` declaration is specified therefore...

No need to specify tags anymore

2

In the past, these codes were used by both parser and ripper. On ripper, the type of LHS is `` then type cast was needed. However currently these are only...

This is a follow up of https://github.com/ruby/lrama/pull/443