[clang] [Clang] handle invalid close location in static assert declaration (PR #108701)

[Oleksandr T. via cfe-commits]

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+// RUN: %clang_cc1 -std=c++2a -triple=x86_64-linux -fsyntax-only %s -verify
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a-tarasyuk wrote:

The file refers to cxx26 —is it ok to add tests related to C++20 here?"

https://github.com/llvm/llvm-project/pull/108701