Public bug reported:
*** system details ***
Ubuntu 20.04.1 LTS
g++-10 (Ubuntu 10.2.0-5ubuntu1~20.04) 10.2.0
*** compilation line ***
g++-10 -std=c++20 internal_repro.cpp
*** output ***
internal_repro.cpp:4:4: internal compiler error: in coerce_template_parms, at
cp/pt.c:8971
4 | A<T> a;
| ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-10/README.Bugs> for instructions.
*** code ***
internal_repro.h:
template <undeclared_concept T>
class A{};
internal_repro.cpp:
#include "internal_repro.h"
template <typename T>
A<T> a;
** Affects: gcc-10 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1900145
Title:
declaration of included invalid class template cause crash
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