[Bug c++/101288] Invalid instantiated redeclaration considered valid by gcc

[eligorkadaf at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101288

--- Comment #1 from Eligor Kadaf <eligorkadaf at gmail dot com> ---
Compiler shall provide diagnostics in the current example according to
https://eel.is/c++draft/basic.def.odr#15