--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/SemaCXX/attr-gsl-owner-pointer.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,126 @@
+// RUN: %clang_cc1 -verify -ast-dump %s | \
+// RUN: FileCheck --implicit-check-not OwnerAttr --implicit-check-not PointerAttr %s
+
+int [[gsl::Owner]] i;
+// expected-error@-1 {{'Owner' attribute cannot be applied to types}}
+void [[gsl::Owner]] f();
+// expected-error@-1 {{'Owner' attribute cannot be applied to types}}
+
+[[gsl::Owner]] void f();
+// expected-warning@-1 {{'Owner' attribute only applies to structs}}
+
+union [[gsl::Owner(int)]] Union{};
+// expected-warning@-1 {{'Owner' attribute only applies to structs}}
+
+struct S {
+};
+
+S [[gsl::Owner]] Instance;
+// expected-error@-1 {{'Owner' attribute cannot be applied to types}}
+
+class [[gsl::Owner(7)]] OwnerDerefNoType{};
+// expected-error@-1 {{expected a type}}
+
+class [[gsl::Pointer("int")]] PointerDerefNoType{};
+// expected-error@-1 {{expected a type}}
+
+class [[gsl::Owner(int)]] [[gsl::Pointer(int)]] BothOwnerPointer{};
+// expected-error@-1 {{'Pointer' and 'Owner' attributes are not compatible}}
+// expected-note@-2 {{conflicting attribute is here}}
+// CHECK: CXXRecordDecl {{.*}} BothOwnerPointer
+// CHECK: OwnerAttr {{.*}} int
+
+class [[gsl::Owner(void)]] OwnerVoidDerefType{};
+// CHECK: CXXRecordDecl {{.*}} OwnerVoidDerefType
+// CHECK: OwnerAttr {{.*}} void
+class [[gsl::Pointer(void)]] PointerVoidDerefType{};
+// CHECK: CXXRecordDecl {{.*}} PointerVoidDerefType
+// CHECK: PointerAttr {{.*}} void
+
+class [[gsl::Pointer(int)]] AddConflictLater{};
+// CHECK: CXXRecordDecl {{.*}} AddConflictLater
+// CHECK: PointerAttr {{.*}} int
+class [[gsl::Owner(int)]] AddConflictLater;
+// expected-error@-1 {{'Owner' and 'Pointer' attributes are not compatible}}
+// expected-note@-5 {{conflicting attribute is here}}
+// CHECK: CXXRecordDecl {{.*}} AddConflictLater
+// CHECK: PointerAttr {{.*}} Inherited int
+
+class [[gsl::Owner(int)]] AddConflictLater2{};
+// CHECK: CXXRecordDecl {{.*}} AddConflictLater2
+// CHECK: OwnerAttr {{.*}} int
+class [[gsl::Owner(float)]] AddConflictLater2;
+// expected-error@-1 {{'Owner' and 'Owner' attributes are not compatible}}
+// expected-note@-5 {{conflicting attribute is here}}
+// CHECK: CXXRecordDecl {{.*}} AddConflictLater
+// CHECK: OwnerAttr {{.*}} Inherited int
+
+class [[gsl::Owner()]] [[gsl::Owner(int)]] WithAndWithoutParameter{};
+// expected-error@-1 {{'Owner' and 'Owner' attributes are not compatible}}
+// expected-note@-2 {{conflicting attribute is here}}
+// CHECK: CXXRecordDecl {{.*}} WithAndWithoutParameter
+// CHECK: OwnerAttr
+
+class [[gsl::Owner(int &)]] ReferenceType{};
+// expected-error@-1 {{a reference type is an invalid argument to attribute 'Owner'}}
+
+class [[gsl::Pointer(int[])]] ArrayType{};
+// expected-error@-1 {{an array type is an invalid argument to attribute 'Pointer'}}
+
+class [[gsl::Owner]] OwnerMissingParameter{};
+// CHECK: CXXRecordDecl {{.*}} OwnerMissingParameter
+// CHECK: OwnerAttr
+
+class [[gsl::Pointer]] PointerMissingParameter{};
+// CHECK: CXXRecordDecl {{.*}} PointerMissingParameter
+// CHECK: PointerAttr
+
+class [[gsl::Owner()]] OwnerWithEmptyParameterList{};
+// CHECK: CXXRecordDecl {{.*}} OwnerWithEmptyParameterList
+// CHECK: OwnerAttr {{.*}}
+
+class [[gsl::Pointer()]] PointerWithEmptyParameterList{};
+// CHECK: CXXRecordDecl {{.*}} PointerWithEmptyParameterList
+// CHECK: PointerAttr {{.*}}
+
+struct [[gsl::Owner(int)]] AnOwner{};
+// CHECK: CXXRecordDecl {{.*}} AnOwner
+// CHECK: OwnerAttr {{.*}} int
+
+struct S;
+class [[gsl::Pointer(S)]] APointer{};
+// CHECK: CXXRecordDecl {{.*}} APointer
+// CHECK: PointerAttr {{.*}} S
+
+class [[gsl::Owner(int)]] [[gsl::Owner(int)]] DuplicateOwner{};
+// CHECK: CXXRecordDecl {{.*}} DuplicateOwner
+// CHECK: OwnerAttr {{.*}} int
+
+class [[gsl::Pointer(int)]] [[gsl::Pointer(int)]] DuplicatePointer{};
+// CHECK: CXXRecordDecl {{.*}} DuplicatePointer
+// CHECK: PointerAttr {{.*}} int
+
+class [[gsl::Owner(int)]] AddTheSameLater{};
+// CHECK: CXXRecordDecl {{.*}} AddTheSameLater
+// CHECK: OwnerAttr {{.*}} int
+
+class [[gsl::Owner(int)]] AddTheSameLater;
+// CHECK: CXXRecordDecl {{.*}} prev {{.*}} AddTheSameLater
+// CHECK: OwnerAttr {{.*}} int
+
+template <class T>
+class [[gsl::Owner]] ForwardDeclared;
+// CHECK: ClassTemplateDecl {{.*}} ForwardDeclared
+// CHECK: OwnerAttr {{.*}}
+// CHECK: ClassTemplateSpecializationDecl {{.*}} ForwardDeclared
+// CHECK: TemplateArgument type 'int'
+// CHECK: OwnerAttr {{.*}}
+
+template <class T>
+class [[gsl::Owner]] ForwardDeclared {
+// CHECK: ClassTemplateDecl {{.*}} ForwardDeclared
+// CHECK: CXXRecordDecl {{.*}} ForwardDeclared definition
+// CHECK: OwnerAttr {{.*}}
+};
+
+static_assert(sizeof(ForwardDeclared<int>), ""); // Force instantiation.