can't reproduce, I get:
$ g++-10 -std=c++20 internal_repro.cpp
In file included from internal_repro.cpp:1:
internal_repro.h:1:11: error: ‘undeclared_concept’ has not been declared
1 | template <undeclared_concept T>
| ^~~~~~~~~~~~~~~~~~
$ g++-10 --version
g++-10 (Ubuntu 10.2.0-5ubuntu1~20.04) 10.2.0
** Changed in: gcc-10 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1900145
Title:
declaration of included invalid class template cause crash
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