Akim Demaille 35b8e0e947 parser: deprecate %error-verbose ...

It is unfortunate that %error_verbose was properly diagnosed as
obsoleted by "%define parse.error verbose", but %error-verbose was
not.

* src/parse-gram.y (%error-verbose): Remove support.
* src/scan-gram.l: Do it here instead, with a warning.
* tests/input.at (Deprecated directives): Check it.

2018-11-12 07:41:46 +01:00

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