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`uncast()` is declared `static`, giving it internal linkage, which makes it a TU-local entity per [basic.link]. A TU-local entity declared in a header can easily turn any declaration that names it ([basic.link]/14) into an exposure — which [basic.link]/17 makes ill-formed in a module interface unit or module partition, and deprecated in any other context.
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uncast()is declaredstatic, giving it internal linkage, which makes it a TU-local entity per [basic.link]. A TU-local entity declared in a header can easily turn any declaration that names it ([basic.link]/14) into an exposure — which [basic.link]/17 makes ill-formed in a module interface unit or module partition, and deprecated in any other context.