[DiagnosticsQoI] Inform the User When Unavailable Inits Are Called #36824
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When a no-args init is the only designated init in the superclass, Swift will automatically
call it from the subclass. Unfortunately, if this initializer is
unavailable, an error is issued that points at the subclass' init but
makes no mention of the implicit call. Fix that by providing a note that
explains what's going on here.