llvm-project

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Richard Smith 907cefe721 Always deduce the lengths of contained parameter packs when deducing a pack expansion. Previously, if all parameter / argument pairs for a pack expansion deduction were non-deduced contexts, we would not deduce the arity of the pack, and could end up deducing a different arity (leading to failures during substitution) or defaulting to an arity of 0 (leading to bad diagnostics about passing the wrong number of arguments to a variadic function). Instead, we now always deduce the arity for all involved packs any time we deduce a pack expansion. This will result in less substitution happening in some cases, which could avoid non-SFINAEable errors, and should generally improve the quality of diagnostics when passing initializer lists to variadic functions.	2020-01-06 17:24:29 -08:00
..
temp.arg.explicit	…
temp.deduct	Always deduce the lengths of contained parameter packs when deducing a	2020-01-06 17:24:29 -08:00

Richard Smith 907cefe721 Always deduce the lengths of contained parameter packs when deducing a

pack expansion.

Previously, if all parameter / argument pairs for a pack expansion
deduction were non-deduced contexts, we would not deduce the arity of
the pack, and could end up deducing a different arity (leading to
failures during substitution) or defaulting to an arity of 0 (leading to
bad diagnostics about passing the wrong number of arguments to a
variadic function). Instead, we now always deduce the arity for all
involved packs any time we deduce a pack expansion.

This will result in less substitution happening in some cases, which
could avoid non-SFINAEable errors, and should generally improve the
quality of diagnostics when passing initializer lists to variadic
functions.

2020-01-06 17:24:29 -08:00

temp.arg.explicit

…

temp.deduct

Always deduce the lengths of contained parameter packs when deducing a

2020-01-06 17:24:29 -08:00