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 


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