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PR c++/35722 Implement N2555 (expanding pack expansion to fixed parm list) * pt.c (coerce_template_parms): Allow expanding a pack expansion to a fixed-length argument list. (unify_pack_expansion): Handle explicit args properly. (unify) [TREE_VEC]: Handle pack expansions here. [TYPE_ARGUMENT_PACK]: Not here. (tsubst_pack_expansion): Don't try to do partial substitution. (pack_deducible_p): New. (fn_type_unification): Use it. (find_parameter_packs_r): Take the TYPE_MAIN_VARIANT of a type parameter. (check_non_deducible_conversion): Split from type_unification_real. (unify_one_argument): Split from type_unification_real... (unify_pack_expansion): ...and here. Drop call_args_p parm. (type_unification_real, unify, more_specialized_fn): Adjust. From-SVN: r179436
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.