Issue #9293 has been reported by usa (Usaku NAKAMURA).

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Backport #9293: please backport r42282 (compile error with newer bison)
https://bugs.ruby-lang.org/issues/9293

Author: usa (Usaku NAKAMURA)
Status: Open
Priority: Normal
Assignee: 
Category: build
Target version: 


2.0.0 and 1.9.3 have been already backported the patch.
The Changelog says about bison 3.0, but I found that there is the same problem with bison 2.7.12.


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