Use foo? instead of foo_opt
#422
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LGTM, this is what I expected! |
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Motivation
racc's v1.8.0 has been released:
https://github.com/ruby/racc/releases/tag/v1.8.0
So we got a new grammar.
This pull request uses
Option:?. WDYT?see: https://www.antlr.org/