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82c2acd0bc
Here for
using type = decltype([]{});
static_assert(is_same_v<type, type>);
we strip the alias ahead of time during template argument coercion
which effectively transforms the template-id into
is_same_v<decltype([]{}), decltype([]{})>
which is wrong because later substitution into the template-id will
produce two new lambdas with distinct types and cause is_same_v to
return false.
This demonstrates that such aliases should be considered opaque (a
notion that we recently introduced in r15-2331-g523836716137d0).
(An alternative solution might be to consider memoizing lambda-expr
substitution rather than always producing a new lambda, but this is
much simpler.)
PR c++/116714
PR c++/107390
gcc/cp/ChangeLog:
* pt.cc (dependent_opaque_alias_p): Also return true for a
decltype(lambda) alias.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/lambda-uneval18.C: New test.
Reviewed-by: Jason Merrill <jason@redhat.com>
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