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Hi! This is an artifact of how LLVM works. Essentially, LLVM detects that `var` is unused and deletes it before it tries to lower the `llvm.objectsize` (which is what clang lowers `__builtin_object_size` to) call to a constant. While this isn't ideal, I don't think it realistically a problem, because `var` must be otherwise unused for this behavior to occur, and the whole purpose of