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On
%token <int> FOO BAR
we currently generate make_FOO(int) and make_BAR(int). However, in
order to factor their scanners, some users would also like to have
make_symbol(tok, int), where tok is FOO or BAR. To ensure type
safety, add assertions that do check that value type and token type
match. Bind this assertion to the parse.assert %define variable.
Suggested by Frank Heckenbach.
http://lists.gnu.org/archive/html/bug-bison/2018-12/msg00034.html
Should also match expectations from Аскар Сафин.
http://lists.gnu.org/archive/html/bug-bison/2018-12/msg00023.html
* data/variant.hh: Use b4_token_visible_if where applicable.
(_b4_type_constructor_declare, _b4_type_constructor_define): New.
Use them.