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Suggested by Joel E. Denny. http://lists.gnu.org/archive/html/bison-patches/2013-03/msg00016.html * data/bison.m4 (b4_percent_define_get_kind): New. (b4_variant_flag): Check that api.value.type is defined as the 'variant' keyword value. * data/c.m4 (_b4_value_type_setup_keyword): New. (b4_value_type_setup): Use it to simplify reading. Use b4_define_silent. Decode api.value.type, including its type. (b4_value_type_define): Likewise. * data/c++.m4 (b4_value_type_declare): Adjust the decoding of api.value.type, taking its kind into account. * doc/bison.texi: Adjust all the examples to the new syntax. * NEWS: Ditto. * tests/types.at: Adjust