[basic.stc] Temporary object and its storage duration CWG1634

[basic.stc.general] p2

Static, thread, and automatic storage durations are associated with objects introduced by declarations ([basic.def]) and implicitly created by the implementation.

The rule explicitly says a temporary object can have a storage duration. However, in the subsequent subclause, the [basic.stc.static], [basic.stc.thread] and [basic.stc.auto] do not state what storage duration the temporary object should have. It only applies to variables.

Since [basic.pre] p6 says

A variable is introduced by the declaration of a reference other than a non-static data member or of an object. The variable's name, if any, denotes the reference or object.

The temporary object is never introduced by a declaration but is created in order to satisfy the requirement of a language construct. Hence, a temporary object is not a variable. This issue is also discussed at https://stackoverflow.com/questions/47945299/what-is-a-temporary-object-with-static-storage-duration

Start by reading the cited [basic.stc.general], [basic.stc.static], [basic.stc.thread], [basic.stc.auto], and [basic.pre] paragraphs, then review the linked Stack Overflow discussion. Determine what wording or cross-reference is needed to specify temporary-object storage duration, and consider the issue resolved when the relevant standard text is unambiguous.