Annex D (normative) Compatibility features [depr]

D.6 Non-local use of TU-local entities [depr.local]

A declaration of a non-TU-local entity that is an exposure ([]) is deprecated.
[Note 1: 
Such a declaration in an importable module unit is ill-formed.
— end note]
[Example 1: namespace { struct A { void f() {} }; } A h(); // deprecated: not internal linkage inline void g() {A().f();} // deprecated: inline and not internal linkage — end example]