tree e0586f5ada190ee453cbb83afd67d2a7b842c331
parent d111e6481afa71fedc0a1877d20943e43954edce
author Eli Friedman <efriedma@quicinc.com> 1741570735 -0700
committer GitHub <noreply@github.com> 1741570735 -0700
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[clang] Reject constexpr-unknown values as constant expressions more consistently (#129952)

Perform the check for constexpr-unknown values in the same place we
perform checks for other values which don't count as constant
expressions.

While I'm here, also fix a rejects-valid with a reference that doesn't
have an initializer. This diagnostic was also covering up some of the
bugs here.

The existing behavior with -fexperimental-new-constant-interpreter seems
to be correct, but the diagnostics are slightly different; it would be
helpful if someone could check on that as a followup.

Followup to #128409.

Fixes #129844. Fixes #129845.