[Bug c++/78358] [7 Regression] wrong types for std::tuple decomposition

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78358

--- Comment #3 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
T.C. wrote: »decltype applied to an identifier declared by a decomposition
declaration returns the referenced type, which for the tuple-like case is the
exact type returned by std::tuple_element«