https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91484
Bug ID: 91484
Summary: Error message: std::is_constructible with incomplete
types.
Product: gcc
Version: 9.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: asschool at yandex dot ru
Target Milestone: ---
https://godbolt.org/z/BGkt7T
https://godbolt.org/z/EyDV9s
GCC correctly(i suppose) reports UB in the first example, but not in the second
one.
Real-life example:
https://godbolt.org/z/gSkmMW
