rsmith added a comment. Under http://eel.is/c++draft/cpp#cond-7.sentence-2, the identifier `__has_include` can't appear anywhere other than in the context of an `#if`, `#elif`, `#iifdef`, or `#ifndef`. That's what we should be checking for and diagnosing here (and we should produce an `ExtWarn` rather than a `Warning` for this case, because such code is ill-formed, and accepting it at all is a language extension compared to the C++ rules). We should apply the same behavior to `__has_cpp_attribute`, to which the same rule applies.
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