Akim Demaille d92ed9d9f7 diagnostics: complain about Bison directives when -Wyacc ...

* src/complain.h, src/complain.c (bison_directive): New.
* src/scan-gram.l (BISON_DIRECTIVE): New.
Use it for Bison extensions.

2018-11-29 06:16:20 +01:00

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