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-rw-r--r--clang/include/clang/AST/Decl.h4
-rw-r--r--clang/include/clang/AST/DeclTemplate.h14
-rw-r--r--clang/include/clang/Basic/DiagnosticSemaKinds.td13
-rw-r--r--clang/include/clang/Sema/Sema.h33
-rw-r--r--clang/lib/AST/Decl.cpp15
-rw-r--r--clang/lib/Sema/SemaCXXScopeSpec.cpp31
-rw-r--r--clang/lib/Sema/SemaExpr.cpp87
-rw-r--r--clang/lib/Sema/SemaLookup.cpp75
-rw-r--r--clang/lib/Sema/SemaTemplate.cpp158
-rw-r--r--clang/lib/Sema/SemaTemplateInstantiate.cpp15
-rw-r--r--clang/lib/Sema/SemaTemplateInstantiateDecl.cpp8
-rw-r--r--clang/lib/Sema/SemaType.cpp20
-rw-r--r--clang/test/Modules/Inputs/cxx-templates-common.h17
-rw-r--r--clang/test/Modules/Inputs/cxx-templates-unimported.h43
-rw-r--r--clang/test/Modules/Inputs/module.map2
-rw-r--r--clang/test/Modules/cxx-templates.cpp70
16 files changed, 527 insertions, 78 deletions
diff --git a/clang/include/clang/AST/Decl.h b/clang/include/clang/AST/Decl.h
index 04c4b46c9f9..8229078b505 100644
--- a/clang/include/clang/AST/Decl.h
+++ b/clang/include/clang/AST/Decl.h
@@ -3184,6 +3184,10 @@ public:
return isCompleteDefinition() || isFixed();
}
+ /// \brief Retrieve the enum definition from which this enumeration could
+ /// be instantiated, if it is an instantiation (rather than a non-template).
+ EnumDecl *getTemplateInstantiationPattern() const;
+
/// \brief Returns the enumeration (declared within the template)
/// from which this enumeration type was instantiated, or NULL if
/// this enumeration was not instantiated from any template.
diff --git a/clang/include/clang/AST/DeclTemplate.h b/clang/include/clang/AST/DeclTemplate.h
index 7e6dfbba27c..d4e9f65e914 100644
--- a/clang/include/clang/AST/DeclTemplate.h
+++ b/clang/include/clang/AST/DeclTemplate.h
@@ -1876,6 +1876,10 @@ public:
cast<ClassTemplatePartialSpecializationDecl>(getFirstDecl());
return First->InstantiatedFromMember.getPointer();
}
+ ClassTemplatePartialSpecializationDecl *
+ getInstantiatedFromMemberTemplate() const {
+ return getInstantiatedFromMember();
+ }
void setInstantiatedFromMember(
ClassTemplatePartialSpecializationDecl *PartialSpec) {
@@ -2511,17 +2515,11 @@ public:
/// it was instantiated.
llvm::PointerUnion<VarTemplateDecl *, VarTemplatePartialSpecializationDecl *>
getInstantiatedFrom() const {
- if (getSpecializationKind() != TSK_ImplicitInstantiation &&
- getSpecializationKind() != TSK_ExplicitInstantiationDefinition &&
- getSpecializationKind() != TSK_ExplicitInstantiationDeclaration)
+ if (!isTemplateInstantiation(getSpecializationKind()))
return llvm::PointerUnion<VarTemplateDecl *,
VarTemplatePartialSpecializationDecl *>();
- if (SpecializedPartialSpecialization *PartialSpec =
- SpecializedTemplate.dyn_cast<SpecializedPartialSpecialization *>())
- return PartialSpec->PartialSpecialization;
-
- return SpecializedTemplate.get<VarTemplateDecl *>();
+ return getSpecializedTemplateOrPartial();
}
/// \brief Retrieve the variable template or variable template partial
diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index 28612e6c706..413d5939abd 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -3710,6 +3710,8 @@ def err_template_spec_unknown_kind : Error<
"class template">;
def note_specialized_entity : Note<
"explicitly specialized declaration is here">;
+def note_explicit_specialization_declared_here : Note<
+ "explicit specialization declared here">;
def err_template_spec_decl_function_scope : Error<
"explicit specialization of %0 in function scope">;
def err_template_spec_decl_class_scope : Error<
@@ -3832,6 +3834,8 @@ def err_partial_spec_ordering_ambiguous : Error<
def note_partial_spec_match : Note<"partial specialization matches %0">;
def err_partial_spec_redeclared : Error<
"class template partial specialization %0 cannot be redeclared">;
+def note_partial_specialization_declared_here : Note<
+ "explicit specialization declared here">;
def note_prev_partial_spec_here : Note<
"previous declaration of class template partial specialization %0 is here">;
def err_partial_spec_fully_specialized : Error<
@@ -8262,14 +8266,17 @@ def err_module_private_local_class : Error<
"local %select{struct|interface|union|class|enum}0 cannot be declared "
"__module_private__">;
def err_module_unimported_use : Error<
- "%select{declaration|definition|default argument}0 of %1 must be imported "
+ "%select{declaration|definition|default argument|"
+ "explicit specialization|partial specialization}0 of %1 must be imported "
"from module '%2' before it is required">;
def err_module_unimported_use_header : Error<
"missing '#include %3'; "
- "%select{declaration|definition|default argument}0 of %1 must be imported "
+ "%select{declaration|definition|default argument|"
+ "explicit specialization|partial specialization}0 of %1 must be imported "
"from module '%2' before it is required">;
def err_module_unimported_use_multiple : Error<
- "%select{declaration|definition|default argument}0 of %1 must be imported "
+ "%select{declaration|definition|default argument|"
+ "explicit specialization|partial specialization}0 of %1 must be imported "
"from one of the following modules before it is required:%2">;
def ext_module_import_in_extern_c : ExtWarn<
"import of C++ module '%0' appears within extern \"C\" language linkage "
diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index 7731569fbce..5765b9b1546 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -1404,6 +1404,16 @@ public:
bool isVisible(const NamedDecl *D) {
return !D->isHidden() || isVisibleSlow(D);
}
+
+ /// Determine whether any declaration of an entity is visible.
+ bool
+ hasVisibleDeclaration(const NamedDecl *D,
+ llvm::SmallVectorImpl<Module *> *Modules = nullptr) {
+ return isVisible(D) || hasVisibleDeclarationSlow(D, Modules);
+ }
+ bool hasVisibleDeclarationSlow(const NamedDecl *D,
+ llvm::SmallVectorImpl<Module *> *Modules);
+
bool hasVisibleMergedDefinition(NamedDecl *Def);
/// Determine if \p D has a visible definition. If not, suggest a declaration
@@ -1420,6 +1430,11 @@ public:
hasVisibleDefaultArgument(const NamedDecl *D,
llvm::SmallVectorImpl<Module *> *Modules = nullptr);
+ /// Determine if there is a visible declaration of \p D that is a member
+ /// specialization declaration (as opposed to an instantiated declaration).
+ bool hasVisibleMemberSpecialization(
+ const NamedDecl *D, llvm::SmallVectorImpl<Module *> *Modules = nullptr);
+
/// Determine if \p A and \p B are equivalent internal linkage declarations
/// from different modules, and thus an ambiguity error can be downgraded to
/// an extension warning.
@@ -1864,17 +1879,31 @@ public:
enum class MissingImportKind {
Declaration,
Definition,
- DefaultArgument
+ DefaultArgument,
+ ExplicitSpecialization,
+ PartialSpecialization
};
/// \brief Diagnose that the specified declaration needs to be visible but
/// isn't, and suggest a module import that would resolve the problem.
void diagnoseMissingImport(SourceLocation Loc, NamedDecl *Decl,
- bool NeedDefinition, bool Recover = true);
+ MissingImportKind MIK, bool Recover = true);
void diagnoseMissingImport(SourceLocation Loc, NamedDecl *Decl,
SourceLocation DeclLoc, ArrayRef<Module *> Modules,
MissingImportKind MIK, bool Recover);
+ /// \brief We've found a use of a templated declaration that would trigger an
+ /// implicit instantiation. Check that any relevant explicit specializations
+ /// and partial specializations are visible, and diagnose if not.
+ /// \return Whether a problem was diagnosed.
+ void checkSpecializationVisibility(SourceLocation Loc, NamedDecl *Spec);
+
+ /// \brief We've found a use of a template specialization that would select a
+ /// partial specialization. Check that the partial specialization is visible,
+ /// and diagnose if not.
+ void checkPartialSpecializationVisibility(SourceLocation Loc,
+ NamedDecl *Spec);
+
/// \brief Retrieve a suitable printing policy.
PrintingPolicy getPrintingPolicy() const {
return getPrintingPolicy(Context, PP);
diff --git a/clang/lib/AST/Decl.cpp b/clang/lib/AST/Decl.cpp
index 9246f94e845..98bc36bbbdd 100644
--- a/clang/lib/AST/Decl.cpp
+++ b/clang/lib/AST/Decl.cpp
@@ -3687,6 +3687,21 @@ void EnumDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
MSI->setPointOfInstantiation(PointOfInstantiation);
}
+EnumDecl *EnumDecl::getTemplateInstantiationPattern() const {
+ if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
+ if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
+ EnumDecl *ED = getInstantiatedFromMemberEnum();
+ while (auto *NewED = ED->getInstantiatedFromMemberEnum())
+ ED = NewED;
+ return ED;
+ }
+ }
+
+ assert(!isTemplateInstantiation(getTemplateSpecializationKind()) &&
+ "couldn't find pattern for enum instantiation");
+ return nullptr;
+}
+
EnumDecl *EnumDecl::getInstantiatedFromMemberEnum() const {
if (SpecializationInfo)
return cast<EnumDecl>(SpecializationInfo->getInstantiatedFrom());
diff --git a/clang/lib/Sema/SemaCXXScopeSpec.cpp b/clang/lib/Sema/SemaCXXScopeSpec.cpp
index 2e774dd28ce..ab0e709a97e 100644
--- a/clang/lib/Sema/SemaCXXScopeSpec.cpp
+++ b/clang/lib/Sema/SemaCXXScopeSpec.cpp
@@ -117,8 +117,18 @@ DeclContext *Sema::computeDeclContext(const CXXScopeSpec &SS,
// specializations, we're entering into the definition of that
// class template partial specialization.
if (ClassTemplatePartialSpecializationDecl *PartialSpec
- = ClassTemplate->findPartialSpecialization(ContextType))
+ = ClassTemplate->findPartialSpecialization(ContextType)) {
+ // A declaration of the partial specialization must be visible.
+ // We can always recover here, because this only happens when we're
+ // entering the context, and that can't happen in a SFINAE context.
+ assert(!isSFINAEContext() &&
+ "partial specialization scope specifier in SFINAE context?");
+ if (!hasVisibleDeclaration(PartialSpec))
+ diagnoseMissingImport(SS.getLastQualifierNameLoc(), PartialSpec,
+ MissingImportKind::PartialSpecialization,
+ /*Recover*/true);
return PartialSpec;
+ }
}
} else if (const RecordType *RecordT = NNSType->getAs<RecordType>()) {
// The nested name specifier refers to a member of a class template.
@@ -195,6 +205,8 @@ bool Sema::RequireCompleteDeclContext(CXXScopeSpec &SS,
TagDecl *tag = dyn_cast<TagDecl>(DC);
// If this is a dependent type, then we consider it complete.
+ // FIXME: This is wrong; we should require a (visible) definition to
+ // exist in this case too.
if (!tag || tag->isDependentContext())
return false;
@@ -218,10 +230,23 @@ bool Sema::RequireCompleteDeclContext(CXXScopeSpec &SS,
// Fixed enum types are complete, but they aren't valid as scopes
// until we see a definition, so awkwardly pull out this special
// case.
- // FIXME: The definition might not be visible; complain if it is not.
const EnumType *enumType = dyn_cast_or_null<EnumType>(tagType);
- if (!enumType || enumType->getDecl()->isCompleteDefinition())
+ if (!enumType)
return false;
+ if (enumType->getDecl()->isCompleteDefinition()) {
+ // If we know about the definition but it is not visible, complain.
+ NamedDecl *SuggestedDef = nullptr;
+ if (!hasVisibleDefinition(enumType->getDecl(), &SuggestedDef,
+ /*OnlyNeedComplete*/false)) {
+ // If the user is going to see an error here, recover by making the
+ // definition visible.
+ bool TreatAsComplete = !isSFINAEContext();
+ diagnoseMissingImport(loc, SuggestedDef, MissingImportKind::Definition,
+ /*Recover*/TreatAsComplete);
+ return !TreatAsComplete;
+ }
+ return false;
+ }
// Try to instantiate the definition, if this is a specialization of an
// enumeration temploid.
diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index 6b043368db1..2b89b6bd039 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -12859,39 +12859,53 @@ void Sema::MarkFunctionReferenced(SourceLocation Loc, FunctionDecl *Func,
// set of overloaded functions [...].
//
// We (incorrectly) mark overload resolution as an unevaluated context, so we
- // can just check that here. Skip the rest of this function if we've already
- // marked the function as used.
+ // can just check that here.
bool OdrUse = MightBeOdrUse && IsPotentiallyEvaluatedContext(*this);
- if (Func->isUsed(/*CheckUsedAttr=*/false) || !OdrUse) {
- // C++11 [temp.inst]p3:
- // Unless a function template specialization has been explicitly
- // instantiated or explicitly specialized, the function template
- // specialization is implicitly instantiated when the specialization is
- // referenced in a context that requires a function definition to exist.
- //
- // We consider constexpr function templates to be referenced in a context
- // that requires a definition to exist whenever they are referenced.
- //
- // FIXME: This instantiates constexpr functions too frequently. If this is
- // really an unevaluated context (and we're not just in the definition of a
- // function template or overload resolution or other cases which we
- // incorrectly consider to be unevaluated contexts), and we're not in a
- // subexpression which we actually need to evaluate (for instance, a
- // template argument, array bound or an expression in a braced-init-list),
- // we are not permitted to instantiate this constexpr function definition.
- //
- // FIXME: This also implicitly defines special members too frequently. They
- // are only supposed to be implicitly defined if they are odr-used, but they
- // are not odr-used from constant expressions in unevaluated contexts.
- // However, they cannot be referenced if they are deleted, and they are
- // deleted whenever the implicit definition of the special member would
- // fail.
- if (!Func->isConstexpr() || Func->getBody())
- return;
- CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Func);
- if (!Func->isImplicitlyInstantiable() && (!MD || MD->isUserProvided()))
- return;
- }
+
+ // Determine whether we require a function definition to exist, per
+ // C++11 [temp.inst]p3:
+ // Unless a function template specialization has been explicitly
+ // instantiated or explicitly specialized, the function template
+ // specialization is implicitly instantiated when the specialization is
+ // referenced in a context that requires a function definition to exist.
+ //
+ // We consider constexpr function templates to be referenced in a context
+ // that requires a definition to exist whenever they are referenced.
+ //
+ // FIXME: This instantiates constexpr functions too frequently. If this is
+ // really an unevaluated context (and we're not just in the definition of a
+ // function template or overload resolution or other cases which we
+ // incorrectly consider to be unevaluated contexts), and we're not in a
+ // subexpression which we actually need to evaluate (for instance, a
+ // template argument, array bound or an expression in a braced-init-list),
+ // we are not permitted to instantiate this constexpr function definition.
+ //
+ // FIXME: This also implicitly defines special members too frequently. They
+ // are only supposed to be implicitly defined if they are odr-used, but they
+ // are not odr-used from constant expressions in unevaluated contexts.
+ // However, they cannot be referenced if they are deleted, and they are
+ // deleted whenever the implicit definition of the special member would
+ // fail (with very few exceptions).
+ CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Func);
+ bool NeedDefinition =
+ OdrUse || (Func->isConstexpr() && (Func->isImplicitlyInstantiable() ||
+ (MD && !MD->isUserProvided())));
+
+ // C++14 [temp.expl.spec]p6:
+ // If a template [...] is explicitly specialized then that specialization
+ // shall be declared before the first use of that specialization that would
+ // cause an implicit instantiation to take place, in every translation unit
+ // in which such a use occurs
+ if (NeedDefinition &&
+ (Func->getTemplateSpecializationKind() != TSK_Undeclared ||
+ Func->getMemberSpecializationInfo()))
+ checkSpecializationVisibility(Loc, Func);
+
+ // If we don't need to mark the function as used, and we don't need to
+ // try to provide a definition, there's nothing more to do.
+ if ((Func->isUsed(/*CheckUsedAttr=*/false) || !OdrUse) &&
+ (!NeedDefinition || Func->getBody()))
+ return;
// Note that this declaration has been used.
if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Func)) {
@@ -13797,6 +13811,12 @@ static void DoMarkVarDeclReferenced(Sema &SemaRef, SourceLocation Loc,
assert(!isa<VarTemplatePartialSpecializationDecl>(Var) &&
"Can't instantiate a partial template specialization.");
+ // If this might be a member specialization of a static data member, check
+ // the specialization is visible. We already did the checks for variable
+ // template specializations when we created them.
+ if (TSK != TSK_Undeclared && !isa<VarTemplateSpecializationDecl>(Var))
+ SemaRef.checkSpecializationVisibility(Loc, Var);
+
// Perform implicit instantiation of static data members, static data member
// templates of class templates, and variable template specializations. Delay
// instantiations of variable templates, except for those that could be used
@@ -13840,7 +13860,8 @@ static void DoMarkVarDeclReferenced(Sema &SemaRef, SourceLocation Loc,
}
}
- if(!MarkODRUsed) return;
+ if (!MarkODRUsed)
+ return;
// Per C++11 [basic.def.odr], a variable is odr-used "unless it satisfies
// the requirements for appearing in a constant expression (5.19) and, if
diff --git a/clang/lib/Sema/SemaLookup.cpp b/clang/lib/Sema/SemaLookup.cpp
index 66e3601f047..eaf44861d32 100644
--- a/clang/lib/Sema/SemaLookup.cpp
+++ b/clang/lib/Sema/SemaLookup.cpp
@@ -1482,6 +1482,35 @@ bool Sema::hasVisibleDefaultArgument(const NamedDecl *D,
Modules);
}
+bool Sema::hasVisibleMemberSpecialization(
+ const NamedDecl *D, llvm::SmallVectorImpl<Module *> *Modules) {
+ assert(isa<CXXRecordDecl>(D->getDeclContext()) &&
+ "not a member specialization");
+ for (auto *Redecl : D->redecls()) {
+ // If the specialization is declared at namespace scope, then it's a member
+ // specialization declaration. If it's lexically inside the class
+ // definition then it was instantiated.
+ //
+ // FIXME: This is a hack. There should be a better way to determine this.
+ // FIXME: What about MS-style explicit specializations declared within a
+ // class definition?
+ if (Redecl->getLexicalDeclContext()->isFileContext()) {
+ auto *NonConstR = const_cast<NamedDecl*>(cast<NamedDecl>(Redecl));
+
+ if (isVisible(NonConstR))
+ return true;
+
+ if (Modules) {
+ Modules->push_back(getOwningModule(NonConstR));
+ const auto &Merged = Context.getModulesWithMergedDefinition(NonConstR);
+ Modules->insert(Modules->end(), Merged.begin(), Merged.end());
+ }
+ }
+ }
+
+ return false;
+}
+
/// \brief Determine whether a declaration is visible to name lookup.
///
/// This routine determines whether the declaration D is visible in the current
@@ -1586,18 +1615,36 @@ static NamedDecl *findAcceptableDecl(Sema &SemaRef, NamedDecl *D) {
if (RD == D)
continue;
- if (auto ND = dyn_cast<NamedDecl>(RD)) {
- // FIXME: This is wrong in the case where the previous declaration is not
- // visible in the same scope as D. This needs to be done much more
- // carefully.
- if (LookupResult::isVisible(SemaRef, ND))
- return ND;
- }
+ auto ND = cast<NamedDecl>(RD);
+ // FIXME: This is wrong in the case where the previous declaration is not
+ // visible in the same scope as D. This needs to be done much more
+ // carefully.
+ if (LookupResult::isVisible(SemaRef, ND))
+ return ND;
}
return nullptr;
}
+bool Sema::hasVisibleDeclarationSlow(const NamedDecl *D,
+ llvm::SmallVectorImpl<Module *> *Modules) {
+ assert(!isVisible(D) && "not in slow case");
+
+ for (auto *Redecl : D->redecls()) {
+ auto *NonConstR = const_cast<NamedDecl*>(cast<NamedDecl>(Redecl));
+ if (isVisible(NonConstR))
+ return true;
+
+ if (Modules) {
+ Modules->push_back(getOwningModule(NonConstR));
+ const auto &Merged = Context.getModulesWithMergedDefinition(NonConstR);
+ Modules->insert(Modules->end(), Merged.begin(), Merged.end());
+ }
+ }
+
+ return false;
+}
+
NamedDecl *LookupResult::getAcceptableDeclSlow(NamedDecl *D) const {
if (auto *ND = dyn_cast<NamespaceDecl>(D)) {
// Namespaces are a bit of a special case: we expect there to be a lot of
@@ -4904,7 +4951,7 @@ static NamedDecl *getDefinitionToImport(NamedDecl *D) {
}
void Sema::diagnoseMissingImport(SourceLocation Loc, NamedDecl *Decl,
- bool NeedDefinition, bool Recover) {
+ MissingImportKind MIK, bool Recover) {
assert(!isVisible(Decl) && "missing import for non-hidden decl?");
// Suggest importing a module providing the definition of this entity, if
@@ -4923,9 +4970,7 @@ void Sema::diagnoseMissingImport(SourceLocation Loc, NamedDecl *Decl,
auto Merged = Context.getModulesWithMergedDefinition(Decl);
OwningModules.insert(OwningModules.end(), Merged.begin(), Merged.end());
- diagnoseMissingImport(Loc, Decl, Decl->getLocation(), OwningModules,
- NeedDefinition ? MissingImportKind::Definition
- : MissingImportKind::Declaration,
+ diagnoseMissingImport(Loc, Decl, Decl->getLocation(), OwningModules, MIK,
Recover);
}
@@ -4985,6 +5030,12 @@ void Sema::diagnoseMissingImport(SourceLocation UseLoc, NamedDecl *Decl,
case MissingImportKind::DefaultArgument:
DiagID = diag::note_default_argument_declared_here;
break;
+ case MissingImportKind::ExplicitSpecialization:
+ DiagID = diag::note_explicit_specialization_declared_here;
+ break;
+ case MissingImportKind::PartialSpecialization:
+ DiagID = diag::note_partial_specialization_declared_here;
+ break;
}
Diag(DeclLoc, DiagID);
@@ -5020,7 +5071,7 @@ void Sema::diagnoseTypo(const TypoCorrection &Correction,
assert(Decl && "import required but no declaration to import");
diagnoseMissingImport(Correction.getCorrectionRange().getBegin(), Decl,
- /*NeedDefinition*/ false, ErrorRecovery);
+ MissingImportKind::Declaration, ErrorRecovery);
return;
}
diff --git a/clang/lib/Sema/SemaTemplate.cpp b/clang/lib/Sema/SemaTemplate.cpp
index 9d3bf1c1605..4960a2d1440 100644
--- a/clang/lib/Sema/SemaTemplate.cpp
+++ b/clang/lib/Sema/SemaTemplate.cpp
@@ -2746,9 +2746,11 @@ Sema::CheckVarTemplateId(VarTemplateDecl *Template, SourceLocation TemplateLoc,
// corresponds to these arguments.
void *InsertPos = nullptr;
if (VarTemplateSpecializationDecl *Spec = Template->findSpecialization(
- Converted, InsertPos))
+ Converted, InsertPos)) {
+ checkSpecializationVisibility(TemplateNameLoc, Spec);
// If we already have a variable template specialization, return it.
return Spec;
+ }
// This is the first time we have referenced this variable template
// specialization. Create the canonical declaration and add it to
@@ -2847,8 +2849,8 @@ Sema::CheckVarTemplateId(VarTemplateDecl *Template, SourceLocation TemplateLoc,
}
// 2. Create the canonical declaration.
- // Note that we do not instantiate the variable just yet, since
- // instantiation is handled in DoMarkVarDeclReferenced().
+ // Note that we do not instantiate a definition until we see an odr-use
+ // in DoMarkVarDeclReferenced().
// FIXME: LateAttrs et al.?
VarTemplateSpecializationDecl *Decl = BuildVarTemplateInstantiation(
Template, InstantiationPattern, *InstantiationArgs, TemplateArgs,
@@ -2876,6 +2878,8 @@ Sema::CheckVarTemplateId(VarTemplateDecl *Template, SourceLocation TemplateLoc,
dyn_cast<VarTemplatePartialSpecializationDecl>(InstantiationPattern))
Decl->setInstantiationOf(D, InstantiationArgs);
+ checkSpecializationVisibility(TemplateNameLoc, Decl);
+
assert(Decl && "No variable template specialization?");
return Decl;
}
@@ -3741,7 +3745,7 @@ static bool diagnoseMissingArgument(Sema &S, SourceLocation Loc,
S.diagnoseMissingImport(Loc, cast<NamedDecl>(TD),
D->getDefaultArgumentLoc(), Modules,
Sema::MissingImportKind::DefaultArgument,
- /*Recover*/ true);
+ /*Recover*/true);
return true;
}
@@ -8544,3 +8548,149 @@ bool Sema::IsInsideALocalClassWithinATemplateFunction() {
}
return false;
}
+
+/// \brief Walk the path from which a declaration was instantiated, and check
+/// that every explicit specialization along that path is visible. This enforces
+/// C++ [temp.expl.spec]/6:
+///
+/// If a template, a member template or a member of a class template is
+/// explicitly specialized then that specialization shall be declared before
+/// the first use of that specialization that would cause an implicit
+/// instantiation to take place, in every translation unit in which such a
+/// use occurs; no diagnostic is required.
+///
+/// and also C++ [temp.class.spec]/1:
+///
+/// A partial specialization shall be declared before the first use of a
+/// class template specialization that would make use of the partial
+/// specialization as the result of an implicit or explicit instantiation
+/// in every translation unit in which such a use occurs; no diagnostic is
+/// required.
+class ExplicitSpecializationVisibilityChecker {
+ Sema &S;
+ SourceLocation Loc;
+ llvm::SmallVector<Module *, 8> Modules;
+
+public:
+ ExplicitSpecializationVisibilityChecker(Sema &S, SourceLocation Loc)
+ : S(S), Loc(Loc) {}
+
+ void check(NamedDecl *ND) {
+ if (auto *FD = dyn_cast<FunctionDecl>(ND))
+ return checkImpl(FD);
+ if (auto *RD = dyn_cast<CXXRecordDecl>(ND))
+ return checkImpl(RD);
+ if (auto *VD = dyn_cast<VarDecl>(ND))
+ return checkImpl(VD);
+ if (auto *ED = dyn_cast<EnumDecl>(ND))
+ return checkImpl(ED);
+ }
+
+private:
+ void diagnose(NamedDecl *D, bool IsPartialSpec) {
+ auto Kind = IsPartialSpec ? Sema::MissingImportKind::PartialSpecialization
+ : Sema::MissingImportKind::ExplicitSpecialization;
+ const bool Recover = true;
+
+ // If we got a custom set of modules (because only a subset of the
+ // declarations are interesting), use them, otherwise let
+ // diagnoseMissingImport intelligently pick some.
+ if (Modules.empty())
+ S.diagnoseMissingImport(Loc, D, Kind, Recover);
+ else
+ S.diagnoseMissingImport(Loc, D, D->getLocation(), Modules, Kind, Recover);
+ }
+
+ // Check a specific declaration. There are three problematic cases:
+ //
+ // 1) The declaration is an explicit specialization of a template
+ // specialization.
+ // 2) The declaration is an explicit specialization of a member of an
+ // templated class.
+ // 3) The declaration is an instantiation of a template, and that template
+ // is an explicit specialization of a member of a templated class.
+ //
+ // We don't need to go any deeper than that, as the instantiation of the
+ // surrounding class / etc is not triggered by whatever triggered this
+ // instantiation, and thus should be checked elsewhere.
+ template<typename SpecDecl>
+ void checkImpl(SpecDecl *Spec) {
+ bool IsHiddenExplicitSpecialization = false;
+ if (Spec->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) {
+ IsHiddenExplicitSpecialization =
+ Spec->getMemberSpecializationInfo()
+ ? !S.hasVisibleMemberSpecialization(Spec, &Modules)
+ : !S.hasVisibleDeclaration(Spec);
+ } else {
+ checkInstantiated(Spec);
+ }
+
+ if (IsHiddenExplicitSpecialization)
+ diagnose(Spec->getMostRecentDecl(), false);
+ }
+
+ void checkInstantiated(FunctionDecl *FD) {
+ if (auto *TD = FD->getPrimaryTemplate())
+ checkTemplate(TD);
+ }
+
+ void checkInstantiated(CXXRecordDecl *RD) {
+ auto *SD = dyn_cast<ClassTemplateSpecializationDecl>(RD);
+ if (!SD)
+ return;
+
+ auto From = SD->getSpecializedTemplateOrPartial();
+ if (auto *TD = From.dyn_cast<ClassTemplateDecl *>())
+ checkTemplate(TD);
+ else if (auto *TD =
+ From.dyn_cast<ClassTemplatePartialSpecializationDecl *>()) {
+ if (!S.hasVisibleDeclaration(TD))
+ diagnose(TD, true);
+ checkTemplate(TD);
+ }
+ }
+
+ void checkInstantiated(VarDecl *RD) {
+ auto *SD = dyn_cast<VarTemplateSpecializationDecl>(RD);
+ if (!SD)
+ return;
+
+ auto From = SD->getSpecializedTemplateOrPartial();
+ if (auto *TD = From.dyn_cast<VarTemplateDecl *>())
+ checkTemplate(TD);
+ else if (auto *TD =
+ From.dyn_cast<VarTemplatePartialSpecializationDecl *>()) {
+ if (!S.hasVisibleDeclaration(TD))
+ diagnose(TD, true);
+ checkTemplate(TD);
+ }
+ }
+
+ void checkInstantiated(EnumDecl *FD) {}
+
+ template<typename TemplDecl>
+ void checkTemplate(TemplDecl *TD) {
+ if (TD->isMemberSpecialization()) {
+ if (!S.hasVisibleMemberSpecialization(TD, &Modules))
+ diagnose(TD->getMostRecentDecl(), false);
+ }
+ }
+};
+
+void Sema::checkSpecializationVisibility(SourceLocation Loc, NamedDecl *Spec) {
+ if (!getLangOpts().Modules)
+ return;
+
+ ExplicitSpecializationVisibilityChecker(*this, Loc).check(Spec);
+}
+
+/// \brief Check whether a template partial specialization that we've discovered
+/// is hidden, and produce suitable diagnostics if so.
+void Sema::checkPartialSpecializationVisibility(SourceLocation Loc,
+ NamedDecl *Spec) {
+ llvm::SmallVector<Module *, 8> Modules;
+ if (!hasVisibleDeclaration(Spec, &Modules))
+ diagnoseMissingImport(Loc, Spec, Spec->getLocation(), Modules,
+ MissingImportKind::PartialSpecialization,
+ /*Recover*/true);
+}
diff --git a/clang/lib/Sema/SemaTemplateInstantiate.cpp b/clang/lib/Sema/SemaTemplateInstantiate.cpp
index 42344e487ce..c9eaa243c6c 100644
--- a/clang/lib/Sema/SemaTemplateInstantiate.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiate.cpp
@@ -1859,8 +1859,19 @@ static bool DiagnoseUninstantiableTemplate(Sema &S,
TagDecl *PatternDef,
TemplateSpecializationKind TSK,
bool Complain = true) {
- if (PatternDef && !PatternDef->isBeingDefined())
+ if (PatternDef && !PatternDef->isBeingDefined()) {
+ NamedDecl *SuggestedDef = nullptr;
+ if (!S.hasVisibleDefinition(PatternDef, &SuggestedDef,
+ /*OnlyNeedComplete*/false)) {
+ // If we're allowed to diagnose this and recover, do so.
+ bool Recover = Complain && !S.isSFINAEContext();
+ if (Complain)
+ S.diagnoseMissingImport(PointOfInstantiation, SuggestedDef,
+ Sema::MissingImportKind::Definition, Recover);
+ return !Recover;
+ }
return false;
+ }
if (!Complain || (PatternDef && PatternDef->isInvalidDecl())) {
// Say nothing
@@ -2591,7 +2602,7 @@ Sema::InstantiateClassMembers(SourceLocation PointOfInstantiation,
if (Enum->getDefinition())
continue;
- EnumDecl *Pattern = Enum->getInstantiatedFromMemberEnum();
+ EnumDecl *Pattern = Enum->getTemplateInstantiationPattern();
assert(Pattern && "Missing instantiated-from-template information");
if (TSK == TSK_ExplicitInstantiationDefinition) {
diff --git a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
index 66b274f6260..ee4a0b3331f 100644
--- a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -3585,6 +3585,10 @@ void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation,
Pattern = PatternDecl->getBody(PatternDecl);
}
+ // FIXME: Check that the definition is visible before trying to instantiate
+ // it. This requires us to track the instantiation stack in order to know
+ // which definitions should be visible.
+
if (!Pattern && !PatternDecl->isDefaulted()) {
if (DefinitionRequired) {
if (Function->getPrimaryTemplate())
@@ -4078,6 +4082,10 @@ void Sema::InstantiateVariableDefinition(SourceLocation PointOfInstantiation,
Def = PatternDecl->getOutOfLineDefinition();
}
+ // FIXME: Check that the definition is visible before trying to instantiate
+ // it. This requires us to track the instantiation stack in order to know
+ // which definitions should be visible.
+
// If we don't have a definition of the variable template, we won't perform
// any instantiation. Rather, we rely on the user to instantiate this
// definition (or provide a specialization for it) in another translation
diff --git a/clang/lib/Sema/SemaType.cpp b/clang/lib/Sema/SemaType.cpp
index 1ab43f909a8..c8c8af109b5 100644
--- a/clang/lib/Sema/SemaType.cpp
+++ b/clang/lib/Sema/SemaType.cpp
@@ -6799,8 +6799,8 @@ bool Sema::hasVisibleDefinition(NamedDecl *D, NamedDecl **Suggested,
RD = Pattern;
D = RD->getDefinition();
} else if (auto *ED = dyn_cast<EnumDecl>(D)) {
- while (auto *NewED = ED->getInstantiatedFromMemberEnum())
- ED = NewED;
+ if (auto *Pattern = ED->getTemplateInstantiationPattern())
+ ED = Pattern;
if (OnlyNeedComplete && ED->isFixed()) {
// If the enum has a fixed underlying type, and we're only looking for a
// complete type (not a definition), any visible declaration of it will
@@ -6887,9 +6887,16 @@ bool Sema::RequireCompleteTypeImpl(SourceLocation Loc, QualType T,
}
}
- // If we have a complete type, we're done.
NamedDecl *Def = nullptr;
- if (!T->isIncompleteType(&Def)) {
+ bool Incomplete = T->isIncompleteType(&Def);
+
+ // Check that any necessary explicit specializations are visible. For an
+ // enum, we just need the declaration, so don't check this.
+ if (Def && !isa<EnumDecl>(Def))
+ checkSpecializationVisibility(Loc, Def);
+
+ // If we have a complete type, we're done.
+ if (!Incomplete) {
// If we know about the definition but it is not visible, complain.
NamedDecl *SuggestedDef = nullptr;
if (Def &&
@@ -6898,7 +6905,7 @@ bool Sema::RequireCompleteTypeImpl(SourceLocation Loc, QualType T,
// definition visible.
bool TreatAsComplete = Diagnoser && !isSFINAEContext();
if (Diagnoser)
- diagnoseMissingImport(Loc, SuggestedDef, /*NeedDefinition*/true,
+ diagnoseMissingImport(Loc, SuggestedDef, MissingImportKind::Definition,
/*Recover*/TreatAsComplete);
return !TreatAsComplete;
}
@@ -6991,6 +6998,9 @@ bool Sema::RequireCompleteTypeImpl(SourceLocation Loc, QualType T,
}
}
+ // FIXME: If we didn't instantiate a definition because of an explicit
+ // specialization declaration, check that it's visible.
+
if (!Diagnoser)
return true;
diff --git a/clang/test/Modules/Inputs/cxx-templates-common.h b/clang/test/Modules/Inputs/cxx-templates-common.h
index a9ca6244867..8e730c8a852 100644
--- a/clang/test/Modules/Inputs/cxx-templates-common.h
+++ b/clang/test/Modules/Inputs/cxx-templates-common.h
@@ -53,4 +53,21 @@ template<typename T> struct WithAnonymousDecls {
typedef int X;
};
+namespace hidden_specializations {
+ template<typename T> void fn() {}
+
+ template<typename T> struct cls {
+ static void nested_fn() {}
+ struct nested_cls {};
+ static int nested_var;
+ enum class nested_enum {};
+
+ template<typename U> static void nested_fn_t() {}
+ template<typename U> struct nested_cls_t {};
+ template<typename U> static int nested_var_t;
+ };
+
+ template<typename T> int var;
+}
+
#include "cxx-templates-textual.h"
diff --git a/clang/test/Modules/Inputs/cxx-templates-unimported.h b/clang/test/Modules/Inputs/cxx-templates-unimported.h
new file mode 100644
index 00000000000..c2b6b915924
--- /dev/null
+++ b/clang/test/Modules/Inputs/cxx-templates-unimported.h
@@ -0,0 +1,43 @@
+#include "cxx-templates-common.h"
+
+namespace hidden_specializations {
+ // explicit specializations
+ template<> void fn<int>() {}
+ template<> struct cls<int> {
+ void nested_fn();
+ struct nested_cls;
+ static int nested_var;
+ enum nested_enum : int;
+ };
+ template<> int var<int>;
+
+ // partial specializations
+ template<typename T> struct cls<T*> {
+ void nested_fn();
+ struct nested_cls;
+ static int nested_var;
+ enum nested_enum : int;
+ };
+ template<typename T> int var<T*>;
+
+ // member specializations
+ template<> void cls<void>::nested_fn() {}
+ template<> struct cls<void>::nested_cls {};
+ template<> int cls<void>::nested_var;
+ template<> enum class cls<void>::nested_enum { e };
+ template<> template<typename U> void cls<void>::nested_fn_t() {}
+ template<> template<typename U> struct cls<void>::nested_cls_t {};
+ template<> template<typename U> int cls<void>::nested_var_t;
+
+ // specializations instantiated here are ok if their pattern is
+ inline void use_stuff() {
+ fn<char>();
+ cls<char>();
+ (void)var<char>;
+ cls<char*>();
+ (void)var<char*>;
+ cls<void>::nested_fn_t<char>();
+ cls<void>::nested_cls_t<char>();
+ (void)cls<void>::nested_var_t<char>;
+ }
+}
diff --git a/clang/test/Modules/Inputs/module.map b/clang/test/Modules/Inputs/module.map
index 66b52e9105e..4db1cca925c 100644
--- a/clang/test/Modules/Inputs/module.map
+++ b/clang/test/Modules/Inputs/module.map
@@ -215,6 +215,8 @@ module cxx_linkage_cache {
module cxx_templates_common {
header "cxx-templates-common.h"
+
+ explicit module unimported { header "cxx-templates-unimported.h" }
}
module cxx_templates_a {
diff --git a/clang/test/Modules/cxx-templates.cpp b/clang/test/Modules/cxx-templates.cpp
index ef4e4e420d0..eea90774aa8 100644
--- a/clang/test/Modules/cxx-templates.cpp
+++ b/clang/test/Modules/cxx-templates.cpp
@@ -1,9 +1,9 @@
// RUN: rm -rf %t
-// RUN: not %clang_cc1 -x objective-c++ -fmodules -fimplicit-module-maps -fno-modules-error-recovery -fmodules-cache-path=%t -I %S/Inputs %s -std=c++11 -ast-dump-lookups | FileCheck %s --check-prefix=CHECK-GLOBAL
-// RUN: not %clang_cc1 -x objective-c++ -fmodules -fimplicit-module-maps -fno-modules-error-recovery -fmodules-cache-path=%t -I %S/Inputs %s -std=c++11 -ast-dump-lookups -ast-dump-filter N | FileCheck %s --check-prefix=CHECK-NAMESPACE-N
-// RUN: not %clang_cc1 -x objective-c++ -fmodules -fimplicit-module-maps -fno-modules-error-recovery -fmodules-cache-path=%t -I %S/Inputs %s -std=c++11 -ast-dump -ast-dump-filter SomeTemplate | FileCheck %s --check-prefix=CHECK-DUMP
-// RUN: %clang_cc1 -x objective-c++ -fmodules -fimplicit-module-maps -fno-modules-error-recovery -fmodules-cache-path=%t -I %S/Inputs %s -verify -std=c++11
-// RUN: %clang_cc1 -x objective-c++ -fmodules -fimplicit-module-maps -fno-modules-error-recovery -fmodules-cache-path=%t -I %S/Inputs %s -verify -std=c++11 -DEARLY_IMPORT
+// RUN: not %clang_cc1 -x objective-c++ -fmodules -fimplicit-module-maps -fno-modules-error-recovery -fmodules-cache-path=%t -I %S/Inputs %s -std=c++14 -ast-dump-lookups | FileCheck %s --check-prefix=CHECK-GLOBAL
+// RUN: not %clang_cc1 -x objective-c++ -fmodules -fimplicit-module-maps -fno-modules-error-recovery -fmodules-cache-path=%t -I %S/Inputs %s -std=c++14 -ast-dump-lookups -ast-dump-filter N | FileCheck %s --check-prefix=CHECK-NAMESPACE-N
+// RUN: not %clang_cc1 -x objective-c++ -fmodules -fimplicit-module-maps -fno-modules-error-recovery -fmodules-cache-path=%t -I %S/Inputs %s -std=c++14 -ast-dump -ast-dump-filter SomeTemplate | FileCheck %s --check-prefix=CHECK-DUMP
+// RUN: %clang_cc1 -x objective-c++ -fmodules -fimplicit-module-maps -fno-modules-error-recovery -fmodules-cache-path=%t -I %S/Inputs %s -verify -std=c++14
+// RUN: %clang_cc1 -x objective-c++ -fmodules -fimplicit-module-maps -fno-modules-error-recovery -fmodules-cache-path=%t -I %S/Inputs %s -verify -std=c++14 -DEARLY_IMPORT
#ifdef EARLY_IMPORT
#include "cxx-templates-textual.h"
@@ -105,7 +105,8 @@ void g() {
TemplateInstantiationVisibility<char[1]> tiv1;
TemplateInstantiationVisibility<char[2]> tiv2;
- TemplateInstantiationVisibility<char[3]> tiv3; // expected-error 2{{must be imported from module 'cxx_templates_b_impl'}}
+ TemplateInstantiationVisibility<char[3]> tiv3; // expected-error 5{{must be imported from module 'cxx_templates_b_impl'}}
+ // expected-note@cxx-templates-b-impl.h:10 3{{explicit specialization declared here}}
// expected-note@cxx-templates-b-impl.h:10 2{{previous definition is here}}
TemplateInstantiationVisibility<char[4]> tiv4;
@@ -172,6 +173,63 @@ bool testFriendInClassTemplate(Std::WithFriend<int> wfi) {
return wfi != wfi;
}
+namespace hidden_specializations {
+ // expected-note@cxx-templates-unimported.h:* 1+{{here}}
+ void test() {
+ // For functions, uses that would trigger instantiations of definitions are
+ // not allowed.
+ fn<void>(); // ok
+ fn<char>(); // ok
+ fn<int>(); // expected-error 1+{{explicit specialization of 'fn<int>' must be imported}}
+ cls<void>::nested_fn(); // expected-error 1+{{explicit specialization of 'nested_fn' must be imported}}
+ cls<void>::nested_fn_t<int>(); // expected-error 1+{{explicit specialization of 'nested_fn_t' must be imported}}
+ cls<void>::nested_fn_t<char>(); // expected-error 1+{{explicit specialization of 'nested_fn_t' must be imported}}
+
+ // For classes, uses that would trigger instantiations of definitions are
+ // not allowed.
+ cls<void> *k0; // ok
+ cls<char> *k1; // ok
+ cls<int> *k2; // ok
+ cls<int*> *k3; // ok
+ cls<void>::nested_cls *nk1; // ok
+ cls<void>::nested_cls_t<int> *nk2; // ok
+ cls<void>::nested_cls_t<char> *nk3; // ok
+ cls<int> uk1; // expected-error 1+{{explicit specialization of 'cls<int>' must be imported}} expected-error 1+{{definition of}}
+ cls<int*> uk3; // expected-error 1+{{partial specialization of 'cls<type-parameter-0-0 *>' must be imported}} expected-error 1+{{definition of}}
+ cls<char*> uk4; // expected-error 1+{{partial specialization of 'cls<type-parameter-0-0 *>' must be imported}} expected-error 1+{{definition of}}
+ cls<void>::nested_cls unk1; // expected-error 1+{{explicit specialization of 'nested_cls' must be imported}} expected-error 1+{{definition of}}
+ cls<void>::nested_cls_t<int> unk2; // expected-error 1+{{explicit specialization of 'nested_cls_t' must be imported}} expected-error 1+{{definition of}}
+ cls<void>::nested_cls_t<char> unk3; // expected-error 1+{{explicit specialization of 'nested_cls_t' must be imported}}
+
+ // For enums, uses that would trigger instantiations of definitions are not
+ // allowed.
+ cls<void>::nested_enum e; // ok
+ (void)cls<void>::nested_enum::e; // expected-error 1+{{definition of 'nested_enum' must be imported}} expected-error 1+{{declaration of 'e'}}
+
+ // For variable template specializations, no uses are allowed because
+ // specializations can change the type.
+ (void)sizeof(var<void>); // ok
+ (void)sizeof(var<char>); // ok
+ (void)sizeof(var<int>); // expected-error 1+{{explicit specialization of 'var<int>' must be imported}}
+ (void)sizeof(var<int*>); // expected-error 1+{{partial specialization of 'var<type-parameter-0-0 *>' must be imported}}
+ (void)sizeof(var<char*>); // expected-error 1+{{partial specialization of 'var<type-parameter-0-0 *>' must be imported}}
+ (void)sizeof(cls<void>::nested_var); // ok
+ (void)cls<void>::nested_var; // expected-error 1+{{explicit specialization of 'nested_var' must be imported}}
+ (void)sizeof(cls<void>::nested_var_t<int>); // expected-error 1+{{explicit specialization of 'nested_var_t' must be imported}}
+ (void)sizeof(cls<void>::nested_var_t<char>); // expected-error 1+{{explicit specialization of 'nested_var_t' must be imported}}
+ }
+
+ void cls<int>::nested_fn() {} // expected-error 1+{{explicit specialization of 'cls<int>' must be imported}} expected-error 1+{{definition of}}
+ struct cls<int>::nested_cls {}; // expected-error 1+{{explicit specialization of 'cls<int>' must be imported}} expected-error 1+{{definition of}}
+ int cls<int>::nested_var; // expected-error 1+{{explicit specialization of 'cls<int>' must be imported}} expected-error 1+{{definition of}}
+ enum cls<int>::nested_enum : int {}; // expected-error 1+{{explicit specialization of 'cls<int>' must be imported}} expected-error 1+{{definition of}}
+
+ template<typename T> void cls<T*>::nested_fn() {} // expected-error 1+{{partial specialization of 'cls<type-parameter-0-0 *>' must be imported}}
+ template<typename T> struct cls<T*>::nested_cls {}; // expected-error 1+{{partial specialization of 'cls<type-parameter-0-0 *>' must be imported}}
+ template<typename T> int cls<T*>::nested_var; // expected-error 1+{{partial specialization of 'cls<type-parameter-0-0 *>' must be imported}}
+ template<typename T> enum cls<T*>::nested_enum : int {}; // expected-error 1+{{partial specialization of 'cls<type-parameter-0-0 *>' must be imported}}
+}
+
namespace Std {
void g(); // expected-error {{functions that differ only in their return type cannot be overloaded}}
// expected-note@cxx-templates-common.h:21 {{previous}}
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