tree 98e232d6dfe26f1f10f962eb450b71ff39fe2ca4
parent 99720bbb87d4f1968a3e25075e616063fbc18936
author Eli Friedman <efriedma@quicinc.com> 1747679271 -0700
committer GitHub <noreply@github.com> 1747679271 -0700
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[clang] fix constexpr-unknown handling of self-references. (#132990)

Usually, in constant evaluation, references which are local to the
evaluation have to be initialized before they're accessed. However,
there's one funny special case: the initializer of a reference can refer
to itself. This generally ends up being undefined behavior if it's used
in an evaluated context, but it isn't otherwise forbidden.

In constant evaluation, this splits into two cases: global variables,
and local variables in constexpr functions. This patch handles both of
those cases. (Local variables tends to trip other errors in most cases,
but if you try hard enough, you can get an accepts-invalid.)

Fixes #131330 .