US098 13 p6 Concept<X> as type-constraint vs. id-expression

[wg21bot]

It is surprising that the single syntax Concept<X> can be a type-constraint (which becomes Concept<T,X>, not the Concept<X><T> that would result from adding <T> as for the other kind of type-constraint) or a very different id-expression.

Proposed change:
Add a syntactic disambiguator, perhaps in the trivial form of Concept<,X> for the type-constraint case.

[jfbastien]

EWG Monday: http://wiki.edg.com/bin/view/Wg21belfast/US098

US098 Does EWG want to consider it for C++20

F	A
0	6

(note: many abstains)

No consensus for change.

[jensmaurer]

Rejected. There was no consensus to adopt this change.