[clang] [clang] reject initializing constexpr objects with compound literals that contain non-null pointers (PR #230477)

[Abdulmalek Almkainzi via cfe-commits]

aalmkainzi wrote:

Note this is a continuation of https://github.com/llvm/llvm-project/pull/228776

https://github.com/llvm/llvm-project/pull/230477