e04e140adb
The previous approach broke code generation for the MS ABI due to an unintended code path during constraint substitution. This time we address the issue by inspecting the evaluation contexts and thereby avoiding that code path. This reapplies 96eced624 (#102857).
48 lines
2.2 KiB
C++
48 lines
2.2 KiB
C++
// RUN: %clang_cc1 -std=c++2a -verify %s
|
|
|
|
// Make sure constraint expressions are unevaluated before being substituted
|
|
// into during satisfaction checking.
|
|
|
|
template<typename T> constexpr bool f = T::value;
|
|
// expected-error@-1 4{{type}}
|
|
|
|
namespace unevaluated {
|
|
template<typename T> concept Foo = false && f<int>;
|
|
bool k = Foo<int>;
|
|
template<typename T> requires false && f<int> struct S {};
|
|
// expected-note@-1{{because}}
|
|
using s = S<int>; // expected-error {{constraints not satisfied}}
|
|
template<typename T> void foo() requires false && f<int> { };
|
|
// expected-note@-1{{because}} expected-note@-1{{candidate template ignored}}
|
|
int a = (foo<int>(), 0); // expected-error{{no matching function}}
|
|
template<typename T> void bar() requires requires { requires false && f<int>; } { };
|
|
// expected-note@-1{{because}} expected-note@-1{{candidate template ignored}}
|
|
int b = (bar<int>(), 0); // expected-error{{no matching function}}
|
|
template<typename T> struct M { static void foo() requires false && f<int> { }; };
|
|
// expected-note@-1{{because}}
|
|
int c = (M<int>::foo(), 0);
|
|
// expected-error@-1{{invalid reference to function 'foo': constraints not satisfied}}
|
|
}
|
|
|
|
namespace constant_evaluated {
|
|
template<typename T> requires f<int[0]> struct S {};
|
|
// expected-note@-1{{in instantiation of}} expected-note@-1{{while substituting}}
|
|
using s = S<int>;
|
|
// expected-note@-1 {{while checking}}
|
|
template<typename T> void foo() requires f<int[1]> { };
|
|
// expected-note@-1{{in instantiation}} expected-note@-1{{while substituting}} \
|
|
expected-note@-1{{candidate template ignored}}
|
|
int a = (foo<int>(), 0);
|
|
// expected-note@-1 {{while checking}} expected-error@-1{{no matching function}} \
|
|
expected-note@-1 {{while substituting}}
|
|
template<typename T> void bar() requires requires { requires f<int[2]>; } { };
|
|
// expected-note@-1{{in instantiation}} \
|
|
expected-note@-1{{while substituting}} \
|
|
expected-note@-1 {{while checking the satisfaction of nested requirement}}
|
|
int b = (bar<int>(), 0);
|
|
template<typename T> struct M { static void foo() requires f<int[3]> { }; };
|
|
// expected-note@-1{{in instantiation}} expected-note@-1{{while substituting}}
|
|
int c = (M<int>::foo(), 0);
|
|
// expected-note@-1 {{while checking}}
|
|
}
|