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-rw-r--r--clang/test/CXX/dcl/dcl.decl/p3.cpp35
1 files changed, 35 insertions, 0 deletions
diff --git a/clang/test/CXX/dcl/dcl.decl/p3.cpp b/clang/test/CXX/dcl/dcl.decl/p3.cpp
new file mode 100644
index 00000000000..eec0aa2043a
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+++ b/clang/test/CXX/dcl/dcl.decl/p3.cpp
@@ -0,0 +1,35 @@
+// RUN: %clang_cc1 -std=c++2a -fconcepts-ts -verify %s
+
+template<typename T, typename U>
+constexpr bool is_same_v = false;
+
+template<typename T>
+constexpr bool is_same_v<T, T> = true;
+
+void f1(int a) requires true; // OK
+auto f2(int a) -> bool requires true; // OK
+auto f3(int a) -> bool (*)(int b) requires true; // OK
+auto f4(int a) requires true -> bool; // expected-error{{trailing return type must appear before trailing requires clause}}
+int f5(int a) requires; // expected-error{{expected expression}}
+int f6(int a) requires {} // expected-error{{expected expression}}
+void (f7()) requires true;
+void (f8() requires true); // expected-error{{trailing requires clause should be placed outside parentheses}}
+void (*(f9 requires (true)))(); // expected-error{{trailing requires clause should be placed outside parentheses}}
+static_assert(is_same_v<decltype(f9), void (*)()>);
+void (*pf)() requires true; // expected-error{{trailing requires clause can only be used when declaring a function}}
+void g1(int (*dsdads)() requires false); // expected-error{{trailing requires clause can only be used when declaring a function}}
+void g2(int (*(*dsdads)())() requires true); // expected-error{{trailing requires clause can only be used when declaring a function}}
+void g3(int (*(*dsdads)(int) requires true)() ); // expected-error{{trailing requires clause should be placed outside parentheses}}
+using T = void ();
+T x requires true;
+struct S {
+ T m1 requires true, m2 requires true;
+};
+
+template<typename T>
+struct R {
+ R(T t);
+};
+
+template<typename T>
+R(T) -> R<T> requires true; // expected-error{{deduction guide cannot have a requires clause}}
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