https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95298

janpmoeller at gmx dot de changed:

           What    |Removed                     |Added
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                 CC|                            |janpmoeller at gmx dot de

--- Comment #6 from janpmoeller at gmx dot de ---
This still fails in 12.2 and recent trunk: https://godbolt.org/z/vebz3T6sh

I also encountered
- sorry, unimplemented: mangling reference_type
- sorry, unimplemented: mangling typename_type
on heavily templated code.

In the first case, transforming a function with signature
> template<typename... Types>
> constexpr auto foo(Types&&... args) -> 
> tuple<std::unwrap_ref_decay_t<Types>...>
into
> template<typename... Types>
> constexpr auto foo(Types&&... args) -> decltype(auto)
made the compilation error go away.

In the second case, the similar transformation from
> template<typename... Types>
> constexpr auto bar(Types&&... args) noexcept -> tuple<Types&&...>
to
> template<typename... Types>
> constexpr auto bar(Types&&... args) noexcept -> decltype(auto)
helped.

In a reduced example, I wasn't immediately able to reproduce the issue though.
If it helps, I will invest more time to reduce my failing code to a
reasonable-size reproduction.

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