This revision was automatically updated to reflect the committed changes.
Closed by commit rG012898b92cad: [clang] p1099 using enum part 1 (authored by
urnathan).
Changed prior to commit:
https://reviews.llvm.org/D100276?vs=349634&id=350578#toc
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D100276/new/
https://reviews.llvm.org/D100276
Files:
clang/include/clang/Basic/DiagnosticSemaKinds.td
clang/include/clang/Sema/Sema.h
clang/lib/Sema/SemaDeclCXX.cpp
clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
clang/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p3.cpp
clang/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p7-cxx20.cpp
clang/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p7.cpp
clang/test/SemaCXX/enum-scoped.cpp
Index: clang/test/SemaCXX/enum-scoped.cpp
===================================================================
--- clang/test/SemaCXX/enum-scoped.cpp
+++ clang/test/SemaCXX/enum-scoped.cpp
@@ -301,8 +301,8 @@
int E::*p; // expected-error {{does not point into a class}}
using E::f; // expected-error {{no member named 'f'}}
- using E::a; // expected-error {{using declaration cannot refer to a scoped enumerator}}
- E b = a; // expected-error {{undeclared}}
+ using E::a; // expected-warning {{using declaration naming a scoped enumerator is a C++20 extension}}
+ E b = a;
}
namespace test11 {
Index: clang/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p7.cpp
===================================================================
--- clang/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p7.cpp
+++ clang/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p7.cpp
@@ -1,4 +1,11 @@
// RUN: %clang_cc1 -std=c++11 -verify %s
+// RUN: %clang_cc1 -std=c++17 -verify %s
+// RUN: %clang_cc1 -std=c++20 -verify %s
enum class EC { ec };
-using EC::ec; // expected-error {{using declaration cannot refer to a scoped enumerator}}
+using EC::ec;
+#if __cplusplus < 202002
+// expected-warning@-2 {{using declaration naming a scoped enumerator is a C++20 extension}}
+#else
+// expected-no-diagnostics
+#endif
Index: clang/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p7-cxx20.cpp
===================================================================
--- /dev/null
+++ clang/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p7-cxx20.cpp
@@ -0,0 +1,271 @@
+// RUN: %clang_cc1 -fsyntax-only -std=c++17 -verify %s
+// RUN: %clang_cc1 -fsyntax-only -std=c++20 -verify %s
+
+// p1099 'using SCOPEDENUM::MEMBER;'
+
+namespace Zero {
+namespace Bob {
+enum class Kevin {
+ Stuart,
+ AlsoStuart
+#if __cplusplus >= 202002L
+// expected-note@-3{{target of using declaration}}
+// expected-note@-3{{target of using declaration}}
+#endif
+};
+} // namespace Bob
+
+using Bob::Kevin::Stuart;
+#if __cplusplus < 202002L
+// expected-warning@-2{{using declaration naming a scoped enumerator is a C++20 extension}}
+#else
+using Bob::Kevin::Stuart;
+
+auto b = Stuart;
+
+namespace Foo {
+int Stuart; // expected-note{{conflicting declaration}}
+using Bob::Kevin::Stuart; // expected-error{{target of using declaration conflicts}}
+
+using Bob::Kevin::AlsoStuart; // expected-note{{using declaration}}
+int AlsoStuart; // expected-error{{declaration conflicts with target}}
+} // namespace Foo
+#endif
+
+} // namespace Zero
+
+namespace One {
+
+// derived from [namespace.udecl]/3
+enum class button { up,
+ down };
+struct S {
+ using button::up;
+#if __cplusplus < 202002L
+ // expected-warning@-2{{a C++20 extension}}
+ // expected-error@-3{{using declaration in class}}
+#else
+ button b = up;
+#endif
+};
+
+#if __cplusplus >= 202002L
+// some more
+struct T : S {
+ button c = up;
+};
+#endif
+enum E2 { e2 };
+} // namespace One
+
+namespace Two {
+enum class E1 { e1 };
+
+struct S {
+ using One::e2;
+#if __cplusplus < 202002L
+ // expected-error@-2{{using declaration in class}}
+#else
+ One::E2 c = e2;
+#endif
+};
+
+} // namespace Two
+
+namespace Three {
+
+enum E3 { e3 };
+struct e3;
+
+struct S {
+ using Three::e3; // expected-error{{using declaration in class}}
+
+ enum class E4 { e4 };
+ enum E5 { e5 };
+};
+
+using S::e5;
+using S::E4::e4;
+#if __cplusplus < 202002L
+// expected-error@-3{{using declaration cannot refer to class member}}
+// expected-note@-4{{use a constexpr variable instead}}
+// expected-warning@-4{{a C++20 extension}}
+// expected-error@-5{{using declaration cannot refer to class member}}
+// expected-note@-6{{use a constexpr variable instead}}
+#else
+auto a = e4;
+auto b = e5;
+#endif
+} // namespace Three
+
+namespace Four {
+
+template <typename T>
+struct TPL {
+ enum class E1 { e1 };
+ struct IN {
+ enum class E2 { e2 };
+ };
+
+protected:
+ enum class E3 { e3 }; // expected-note{{declared protected here}}
+};
+
+using TPL<int>::E1::e1;
+#if __cplusplus < 202002L
+// expected-warning@-2{{a C++20 extension}}
+// expected-error@-3{{using declaration cannot refer to class member}}
+// expected-note@-4{{use a constexpr variable instead}}
+#else
+using TPL<float>::IN::E2::e2;
+
+auto a = e1;
+auto b = e2;
+#endif
+
+enum class E4 { e4 };
+template <typename T>
+struct DER : TPL<int> {
+ using TPL<T>::E1::e1;
+#if __cplusplus < 202002L
+ // expected-warning@-2{{a C++20 extension}}
+ // expected-warning@-3{{using declaration naming a scoped}}
+ // expected-error@-4{{which is not a base}}
+#endif
+ using TPL<T>::E3::e3; // expected-error{{is a protected member}}
+#if __cplusplus < 202002L
+ // expected-warning@-2 2{{using declaration naming a scoped}}
+ // expected-error@-3{{which is not a base}}
+#endif
+
+ using E4::e4;
+#if __cplusplus < 202002L
+ // expected-warning@-2{{a C++20 extension}}
+ // expected-error@-3{{which is not a class}}
+#else
+ auto Foo() { return e1; }
+ auto Bar() { return e2; }
+#endif
+};
+
+DER<float> x; // expected-note{{requested here}}
+DER<int> y;
+#if __cplusplus < 202002L
+// expected-note@-2{{requested here}}
+#else
+auto y1 = y.Foo();
+auto y2 = y.Bar();
+#endif
+} // namespace Four
+
+namespace Five {
+template <unsigned I, unsigned K>
+struct Quux {
+ enum class Q : unsigned; // expected-note{{member is declared here}}
+ enum class R : unsigned { i = I,
+ k = K };
+};
+
+using Quux<1, 2>::Q::nothing; // expected-error{{implicit instantiation of undefined}}
+using Quux<1, 2>::R::i;
+#if __cplusplus < 202002L
+// expected-warning@-2{{a C++20 extension}}
+// expected-error@-3{{using declaration cannot refer to class member}}
+// expected-note@-4{{use a constexpr variable instead}}
+#endif
+
+} // namespace Five
+
+namespace Six {
+template <unsigned I, unsigned K>
+struct Quux {
+ enum class Q : unsigned; // expected-note{{member is declared here}}
+ enum class R : unsigned { i = I,
+ k = K };
+};
+
+template <unsigned I> struct Fido {
+ using Quux<I, I>::Q::nothing; // expected-error{{implicit instantiation of undefined}}
+};
+
+Fido<2> a; // expected-note{{in instantiation}}
+
+} // namespace Six
+
+namespace Seven {
+template <unsigned I, unsigned K>
+struct Quux {
+ enum class R : unsigned { i = I,
+ k = K };
+};
+
+template <unsigned I> struct Toto {
+ using Quux<I, I>::R::i;
+#if __cplusplus < 202002L
+ // expected-warning@-2{{a C++20 extension}}
+// expected-error@-3{{refers into}}
+#else
+ static_assert(unsigned(i) == I);
+#endif
+};
+
+Toto<2> b;
+#if __cplusplus < 202002L
+// expected-note@-2{{in instantiation}}
+#endif
+
+} // namespace Seven
+
+namespace Eight {
+struct Kevin {
+ enum class B { a };
+ enum a {};
+};
+
+using Kevin::B::a;
+#if __cplusplus < 202002L
+// expected-warning@-2{{a C++20 extension}}
+// expected-error@-3{{using declaration cannot refer to class member}}
+// expected-note@-4{{use a constexpr variable instead}}
+#endif
+using Kevin::B::a;
+#if __cplusplus < 202002L
+// expected-warning@-2{{a C++20 extension}}
+// expected-error@-3{{using declaration cannot refer to class member}}
+// expected-note@-4{{use a constexpr variable instead}}
+#endif
+
+class X : Kevin {
+ using Kevin::B::a; // expected-note{{previous using declaration}}
+#if __cplusplus < 202002L
+// expected-warning@-2{{a C++20 extension}}
+#endif
+ using Kevin::a;
+ using Kevin::B::a; // expected-error{{redeclaration of using declaration}}
+};
+
+} // namespace Eight
+
+namespace Nine {
+namespace Q {
+enum class Bob { a };
+using Bob::a;
+#if __cplusplus < 202002L
+// expected-warning@-2{{a C++20 extension}}
+#endif
+} // namespace Q
+
+using Q::a;
+using Q::Bob::a;
+#if __cplusplus < 202002L
+// expected-warning@-2{{a C++20 extension}}
+#endif
+
+#if __cplusplus >= 202002L
+struct Foo {
+ using Q::a; // expected-note{{previous using declaration}}
+ using Q::Bob::a;
+ using Q::a; // expected-error{{redeclaration of using declaration}}
+};
+#endif
+} // namespace Nine
Index: clang/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p3.cpp
===================================================================
--- clang/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p3.cpp
+++ clang/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p3.cpp
@@ -17,6 +17,7 @@
};
class C {
+public:
int g();
};
@@ -42,7 +43,7 @@
#endif
using B::EC;
- using B::EC::ec; // expected-error {{not a class}} expected-warning 0-1 {{C++11}}
+ using B::EC::ec; // expected-warning {{a C++20 extension}} expected-warning 0-1 {{C++11}}
};
namespace test1 {
Index: clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
===================================================================
--- clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -3067,10 +3067,9 @@
}
if (!NewUD->isInvalidDecl() &&
- SemaRef.CheckUsingDeclQualifier(D->getUsingLoc(), D->hasTypename(),
- SS, NameInfo, D->getLocation()))
+ SemaRef.CheckUsingDeclQualifier(D->getUsingLoc(), D->hasTypename(), SS,
+ NameInfo, D->getLocation(), nullptr, D))
NewUD->setInvalidDecl();
-
SemaRef.Context.setInstantiatedFromUsingDecl(NewUD, D);
NewUD->setAccess(D->getAccess());
Owner->addDecl(NewUD);
@@ -3079,6 +3078,8 @@
if (NewUD->isInvalidDecl())
return NewUD;
+ // If the using scope was dependent, or we had dependent bases, we need to
+ // recheck the inheritance
if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName)
SemaRef.CheckInheritingConstructorUsingDecl(NewUD);
Index: clang/lib/Sema/SemaDeclCXX.cpp
===================================================================
--- clang/lib/Sema/SemaDeclCXX.cpp
+++ clang/lib/Sema/SemaDeclCXX.cpp
@@ -11659,7 +11659,7 @@
// This is invalid (during instantiation) in C++03 because B::foo
// resolves to the using decl in B, which is not a base class of D<T>.
// We can't diagnose it immediately because C<T> is an unknown
- // specialization. The UsingShadowDecl in D<T> then points directly
+ // specialization. The UsingShadowDecl in D<T> then points directly
// to A::foo, which will look well-formed when we instantiate.
// The right solution is to not collapse the shadow-decl chain.
if (!getLangOpts().CPlusPlus11 && CurContext->isRecord())
@@ -12088,11 +12088,6 @@
SS, IdentLoc, Previous))
return nullptr;
- // Check for bad qualifiers.
- if (CheckUsingDeclQualifier(UsingLoc, HasTypenameKeyword, SS, NameInfo,
- IdentLoc))
- return nullptr;
-
// 'using_if_exists' doesn't make sense on an inherited constructor.
if (IsUsingIfExists && UsingName.getName().getNameKind() ==
DeclarationName::CXXConstructorName) {
@@ -12104,6 +12099,11 @@
NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
if (!LookupContext || EllipsisLoc.isValid()) {
NamedDecl *D;
+ // Dependent scope, or an unexpanded pack
+ if (!LookupContext && CheckUsingDeclQualifier(UsingLoc, HasTypenameKeyword,
+ SS, NameInfo, IdentLoc))
+ return nullptr;
+
if (HasTypenameKeyword) {
// FIXME: not all declaration name kinds are legal here
D = UnresolvedUsingTypenameDecl::Create(Context, CurContext,
@@ -12156,6 +12156,11 @@
LookupQualifiedName(R, LookupContext);
+ // Validate the context, now we have a lookup
+ if (CheckUsingDeclQualifier(UsingLoc, HasTypenameKeyword, SS, NameInfo,
+ IdentLoc, &R))
+ return nullptr;
+
if (R.empty() && IsUsingIfExists)
R.addDecl(UnresolvedUsingIfExistsDecl::Create(Context, CurContext, UsingLoc,
UsingName.getName()),
@@ -12261,16 +12266,6 @@
return BuildInvalid();
}
- // C++14 [namespace.udecl]p7:
- // A using-declaration shall not name a scoped enumerator.
- if (auto *ED = R.getAsSingle<EnumConstantDecl>()) {
- if (cast<EnumDecl>(ED->getDeclContext())->isScoped()) {
- Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_scoped_enum)
- << SS.getRange();
- return BuildInvalid();
- }
- }
-
UsingDecl *UD = BuildValid();
// Some additional rules apply to inheriting constructors.
@@ -12410,48 +12405,83 @@
return false;
}
-
/// Checks that the given nested-name qualifier used in a using decl
/// in the current context is appropriately related to the current
/// scope. If an error is found, diagnoses it and returns true.
-bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc,
- bool HasTypename,
+/// R is nullptr, if the caller has not (yet) done a lookup, otherwise it's the
+/// result of that lookup. UD is likewise nullptr, except when we have an
+/// already-populated UsingDecl whose shadow decls contain the same information
+/// (i.e. we're instantiating a UsingDecl with non-dependent scope).
+bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, bool HasTypename,
const CXXScopeSpec &SS,
const DeclarationNameInfo &NameInfo,
- SourceLocation NameLoc) {
+ SourceLocation NameLoc,
+ const LookupResult *R, const UsingDecl *UD) {
DeclContext *NamedContext = computeDeclContext(SS);
+ assert(bool(NamedContext) == (R || UD) && !(R && UD) &&
+ "resolvable context must have exactly one set of decls");
+
+ // C++ 20 permits using an enumerator that does not have a class-hierarchy
+ // relationship.
+ bool Cxx20Enumerator = false;
+ if (NamedContext) {
+ EnumConstantDecl *EC = nullptr;
+ if (R)
+ EC = R->getAsSingle<EnumConstantDecl>();
+ else if (UD && UD->shadow_size() == 1)
+ EC = dyn_cast<EnumConstantDecl>(UD->shadow_begin()->getTargetDecl());
+ if (EC)
+ Cxx20Enumerator = getLangOpts().CPlusPlus20;
+
+ if (auto *ED = dyn_cast<EnumDecl>(NamedContext)) {
+ // C++14 [namespace.udecl]p7:
+ // A using-declaration shall not name a scoped enumerator.
+ // C++20 p1099 permits enumerators.
+ if (EC && R && ED->isScoped())
+ Diag(SS.getBeginLoc(),
+ getLangOpts().CPlusPlus20
+ ? diag::warn_cxx17_compat_using_decl_scoped_enumerator
+ : diag::ext_using_decl_scoped_enumerator)
+ << SS.getRange();
+
+ // We want to consider the scope of the enumerator
+ NamedContext = ED->getDeclContext();
+ }
+ }
if (!CurContext->isRecord()) {
// C++03 [namespace.udecl]p3:
// C++0x [namespace.udecl]p8:
// A using-declaration for a class member shall be a member-declaration.
+ // C++20 [namespace.udecl]p7
+ // ... other than an enumerator ...
// If we weren't able to compute a valid scope, it might validly be a
- // dependent class scope or a dependent enumeration unscoped scope. If
- // we have a 'typename' keyword, the scope must resolve to a class type.
- if ((HasTypename && !NamedContext) ||
- (NamedContext && NamedContext->getRedeclContext()->isRecord())) {
- auto *RD = NamedContext
- ? cast<CXXRecordDecl>(NamedContext->getRedeclContext())
- : nullptr;
- if (RD && RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), RD))
- RD = nullptr;
-
- Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member)
+ // dependent class or enumeration scope. If we have a 'typename' keyword,
+ // the scope must resolve to a class type.
+ if (NamedContext ? !NamedContext->getRedeclContext()->isRecord()
+ : !HasTypename)
+ return false; // OK
+
+ Diag(NameLoc,
+ Cxx20Enumerator
+ ? diag::warn_cxx17_compat_using_decl_class_member_enumerator
+ : diag::err_using_decl_can_not_refer_to_class_member)
<< SS.getRange();
- // If we have a complete, non-dependent source type, try to suggest a
- // way to get the same effect.
- if (!RD)
- return true;
+ if (Cxx20Enumerator)
+ return false; // OK
- // Find what this using-declaration was referring to.
- LookupResult R(*this, NameInfo, LookupOrdinaryName);
- R.setHideTags(false);
- R.suppressDiagnostics();
- LookupQualifiedName(R, RD);
+ auto *RD = NamedContext
+ ? cast<CXXRecordDecl>(NamedContext->getRedeclContext())
+ : nullptr;
+ if (RD && !RequireCompleteDeclContext(const_cast<CXXScopeSpec &>(SS), RD)) {
+ // See if there's a helpful fixit
- if (R.getAsSingle<TypeDecl>()) {
+ if (!R) {
+ // We will have already diagnosed the problem on the template
+ // definition, Maybe we should do so again?
+ } else if (R->getAsSingle<TypeDecl>()) {
if (getLangOpts().CPlusPlus11) {
// Convert 'using X::Y;' to 'using Y = X::Y;'.
Diag(SS.getBeginLoc(), diag::note_using_decl_class_member_workaround)
@@ -12468,7 +12498,7 @@
<< FixItHint::CreateInsertion(
InsertLoc, " " + NameInfo.getName().getAsString());
}
- } else if (R.getAsSingle<VarDecl>()) {
+ } else if (R->getAsSingle<VarDecl>()) {
// Don't provide a fixit outside C++11 mode; we don't want to suggest
// repeating the type of the static data member here.
FixItHint FixIt;
@@ -12481,7 +12511,7 @@
Diag(UsingLoc, diag::note_using_decl_class_member_workaround)
<< 2 // reference declaration
<< FixIt;
- } else if (R.getAsSingle<EnumConstantDecl>()) {
+ } else if (R->getAsSingle<EnumConstantDecl>()) {
// Don't provide a fixit outside C++11 mode; we don't want to suggest
// repeating the type of the enumeration here, and we can't do so if
// the type is anonymous.
@@ -12497,15 +12527,11 @@
<< (getLangOpts().CPlusPlus11 ? 4 : 3) // const[expr] variable
<< FixIt;
}
- return true;
}
- // Otherwise, this might be valid.
- return false;
+ return true; // Fail
}
- // The current scope is a record.
-
// If the named context is dependent, we can't decide much.
if (!NamedContext) {
// FIXME: in C++0x, we can diagnose if we can prove that the
@@ -12517,12 +12543,19 @@
return false;
}
+ // The current scope is a record.
if (!NamedContext->isRecord()) {
// Ideally this would point at the last name in the specifier,
// but we don't have that level of source info.
- Diag(SS.getRange().getBegin(),
- diag::err_using_decl_nested_name_specifier_is_not_class)
- << SS.getScopeRep() << SS.getRange();
+ Diag(SS.getBeginLoc(),
+ Cxx20Enumerator
+ ? diag::warn_cxx17_compat_using_decl_non_member_enumerator
+ : diag::err_using_decl_nested_name_specifier_is_not_class)
+ << SS.getScopeRep() << SS.getRange();
+
+ if (Cxx20Enumerator)
+ return false; // OK
+
return true;
}
@@ -12538,19 +12571,25 @@
if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(
cast<CXXRecordDecl>(NamedContext))) {
+
+ if (Cxx20Enumerator) {
+ Diag(NameLoc, diag::warn_cxx17_compat_using_decl_non_member_enumerator)
+ << SS.getRange();
+ return false;
+ }
+
if (CurContext == NamedContext) {
- Diag(NameLoc,
+ Diag(SS.getBeginLoc(),
diag::err_using_decl_nested_name_specifier_is_current_class)
- << SS.getRange();
- return true;
+ << SS.getRange();
+ return !getLangOpts().CPlusPlus20;
}
if (!cast<CXXRecordDecl>(NamedContext)->isInvalidDecl()) {
- Diag(SS.getRange().getBegin(),
+ Diag(SS.getBeginLoc(),
diag::err_using_decl_nested_name_specifier_is_not_base_class)
- << SS.getScopeRep()
- << cast<CXXRecordDecl>(CurContext)
- << SS.getRange();
+ << SS.getScopeRep() << cast<CXXRecordDecl>(CurContext)
+ << SS.getRange();
}
return true;
}
Index: clang/include/clang/Sema/Sema.h
===================================================================
--- clang/include/clang/Sema/Sema.h
+++ clang/include/clang/Sema/Sema.h
@@ -5714,11 +5714,12 @@
const CXXScopeSpec &SS,
SourceLocation NameLoc,
const LookupResult &Previous);
- bool CheckUsingDeclQualifier(SourceLocation UsingLoc,
- bool HasTypename,
+ bool CheckUsingDeclQualifier(SourceLocation UsingLoc, bool HasTypename,
const CXXScopeSpec &SS,
const DeclarationNameInfo &NameInfo,
- SourceLocation NameLoc);
+ SourceLocation NameLoc,
+ const LookupResult *R = nullptr,
+ const UsingDecl *UD = nullptr);
NamedDecl *BuildUsingDeclaration(Scope *S, AccessSpecifier AS,
SourceLocation UsingLoc,
Index: clang/include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -536,6 +536,10 @@
"dependent using declaration resolved to type without 'typename'">;
def err_using_decl_nested_name_specifier_is_not_class : Error<
"using declaration in class refers into '%0', which is not a class">;
+def warn_cxx17_compat_using_decl_non_member_enumerator : Warning<
+ "member using declaration naming non-class '%0' enumerator is "
+ "incompatible with C++ standards before C++20">, InGroup<CXXPre20Compat>,
+ DefaultIgnore;
def err_using_decl_nested_name_specifier_is_current_class : Error<
"using declaration refers to its own class">;
def err_using_decl_nested_name_specifier_is_not_base_class : Error<
@@ -544,6 +548,16 @@
"%0 is not a direct base of %1, cannot inherit constructors">;
def err_using_decl_can_not_refer_to_class_member : Error<
"using declaration cannot refer to class member">;
+def warn_cxx17_compat_using_decl_class_member_enumerator : Warning<
+ "member using declaration naming a non-member enumerator is incompatible "
+ "with C++ standards before C++20">, InGroup<CXXPre20Compat>, DefaultIgnore;
+def ext_using_decl_class_member_enumerator : ExtWarn<
+ "member using declaration naming a non-member enumerator is "
+ "a C++20 extension">, InGroup<CXX20>;
+def err_using_enum_lacks_definition : Error<
+ "enum named by using-enum declaration lacks a definition">;
+def err_using_enum_is_dependent : Error<
+ "using-enum cannot name a dependent type">;
def err_ambiguous_inherited_constructor : Error<
"constructor of %0 inherited from multiple base class subobjects">;
def note_ambiguous_inherited_constructor_using : Note<
@@ -553,8 +567,12 @@
"a const variable|a constexpr variable}0 instead">;
def err_using_decl_can_not_refer_to_namespace : Error<
"using declaration cannot refer to a namespace">;
-def err_using_decl_can_not_refer_to_scoped_enum : Error<
- "using declaration cannot refer to a scoped enumerator">;
+def warn_cxx17_compat_using_decl_scoped_enumerator: Warning<
+ "using declaration naming a scoped enumerator is incompatible with "
+ "C++ standards before C++20">, InGroup<CXXPre20Compat>, DefaultIgnore;
+def ext_using_decl_scoped_enumerator : ExtWarn<
+ "using declaration naming a scoped enumerator is a C++20 extension">,
+ InGroup<CXX20>;
def err_using_decl_constructor : Error<
"using declaration cannot refer to a constructor">;
def warn_cxx98_compat_using_decl_constructor : Warning<
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