erichkeane added a comment.
Comment based on @rsmith and EWG reflector feedback as to where this should be
checked.
================
Comment at: clang/test/SemaTemplate/concepts.cpp:63
template<typename T> concept C = true;
- template<template<typename T> requires C<T> typename U> struct X {}; //
expected-error {{requires 'class'}} expected-error 0+{{}}
+ template<template<typename T> requires C<T> typename U> struct X {};
template<typename T> requires C<T> struct Y {};
----------------
Seemingly if "X" contains U<int>, the constraint should be checked (according
to EWG).
Based on reflector conversations, it seems this should ALSO be checked in:
http://eel.is/c++draft/temp.arg.template#3
and
http://eel.is/c++draft/temp.arg.template#4
, particularly the 'rewrite to function templates in /4 should produce a
constrained function template, and the 'at least as specialized' check takes
these into consideration.
They are ALSO considered in partial ordering.
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D110641/new/
https://reviews.llvm.org/D110641
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