Akim Demaille 35f70d169f variant: more assertions ...

Equip variants with more checking code.  Provide a means to request
includes.

* data/variant.hh (b4_variant_includes): New.
* data/lalr1.cc: Use it.
* data/variant.hh (variant::built): Define at the end, as a private member.
(variant::tname): New.
Somewhat makes "built" useless, but let's keep both for a start, in
case using "typeinfo" is considered unacceptable in some environments.
Fix some formatting issues.

2012-12-19 11:30:22 +01:00

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