efriedma added a comment. We can could add an exception to the "don't allow redeclarations with custom type-checking" rule to specifically allow redeclaring `__va_start`. The general rule is that we don't want user code redeclaring them because they don't have a specific signature, so our internal representation could change between releases. But `__va_start` has a specific fixed signature from the Microsoft SDK headers, so it should be fine to allow redeclaring it without a warning.
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