Akim Demaille 95421df67b tokens: define the "$undefined" token kind ...

* data/skeletons/bison.m4 (b4_symbol_token_kind): Give a definition to
$undefined.
(b4_token_visible_if): $undefined has an id.
* src/output.c (prepare_symbol_definitions): Stop lying: $undefined
_is_ a token.
* tests/input.at: Adjust.

2020-04-12 13:56:43 +02:00

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