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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104507

--- Comment #4 from Daniel Nelson <junk at sigpwr dot com> ---
Yeah, that was my thought as well (though I'm 99% unfamiliar with the GCC
codebase).

Some more bisecting reveals that this was introduced with
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95508

ae2ebf011fec926e003645c33c07a03619ea216a is the first bad commit
commit ae2ebf011fec926e003645c33c07a03619ea216a
Author: Marek Polacek <polacek@redhat.com>
Date:   Wed Jun 17 09:19:02 2020 -0400

    c++: ICE with IMPLICIT_CONV_EXPR in array subscript [PR95508]
...=