https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124781
--- Comment #3 from Marcel Laverdet <marcel at laverdet dot com> ---
Thank you for the lightning-fast responses Nathaniel!
I have another one which probably shouldn't fail. This is not a regression and
also fails on gcc-15.
I would expect both exports to be `int`
-----
export module test;
template <auto Value>
using decltype_t = decltype(Value);
constexpr auto fn = [] { return 0; };
// this is fine
export template <class>
using xx = decltype_t<fn()>;
// this is not
export template <class>
using yy = decltype_t<[] { return 0; }()>;
-----
root[01:18:16] [/workspace] $ g++ -std=c++26 -Wall -fmodules -c a.cc
a.cc:4:7: error: ‘using decltype_t = decltype (<lambda>())’ exposes TU-local
entity ‘template<class> struct<lambda()>’
4 | using decltype_t = decltype(Value);
| ^~~~~~~~~~
a.cc:14:24: note: ‘<lambda()>’ has no name and cannot be differentiated from
similar lambdas in other TUs
14 | using yy = decltype_t<[] { return 0; }()>;
| ^
