On 14 February 2017 at 19:48, Richard Smith <rich...@metafoo.co.uk> wrote:
> On 14 February 2017 at 18:14, Akira Hatanaka <ahatan...@apple.com> wrote:
>
>> Hi Richard,
>>
>> It looks like this commit causes an assertion failure when the following
>> code is compiled:
>>
>> $ cat test1.cpp
>> template<class T>
>> struct S3 {
>> };
>>
>> template<class T>
>> struct S2 {
>> S2(S3<T> &&);
>> };
>>
>> template<class T>
>> struct S1 : S2<T> {
>> using S2<T>::S2;
>> S1();
>> };
>>
>> template<class T>
>> struct S0 {
>> S0();
>> S0(S0&&) = default;
>> S1<T> m1;
>> };
>>
>> void foo1() {
>> S0<int> s0;
>> }
>>
>> $ clang++ -std=c++1z test1.cpp -c -o /dev/null
>>
>> Assertion failed: (Loc.isValid() && "point of instantiation must be
>> valid!"),
>>
>> What’s the right way to fix this?
>>
>
> We should figure out where the invalid source location is coming from and
> pass in a correct location. My current suspicion is the SourceLocation()s
> in Sema::LookupSpecialMember.
>
I fixed those in r295149; the above code no longer asserts.
> The patch I have now just checks whether PointOfInstantiation.isValid()
>> returns true before calling Spec->setPointOfInstantiation at
>> SemaTemplateInstantiate.cpp:1938.
>>
>> On Jan 13, 2017, at 12:46 PM, Richard Smith via cfe-commits <
>> cfe-commits@lists.llvm.org> wrote:
>>
>> Author: rsmith
>> Date: Fri Jan 13 14:46:54 2017
>> New Revision: 291955
>>
>> URL: http://llvm.org/viewvc/llvm-project?rev=291955&view=rev
>> Log:
>> PR31606: Generalize our tentative DR resolution for inheriting copy/move
>> constructors to better match the pre-P0136R1 behavior.
>>
>> Modified:
>> cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td
>> cfe/trunk/lib/Sema/SemaOverload.cpp
>> cfe/trunk/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p15.cpp
>> cfe/trunk/test/CXX/dcl.decl/dcl.init/dcl.init.aggr/p1.cpp
>> cfe/trunk/test/CXX/drs/dr16xx.cpp
>> cfe/trunk/test/CXX/drs/dr19xx.cpp
>> cfe/trunk/test/CXX/special/class.inhctor/p1.cpp
>> cfe/trunk/test/CXX/special/class.inhctor/p3.cpp
>> cfe/trunk/test/CXX/special/class.inhctor/p7.cpp
>> cfe/trunk/test/SemaCXX/cxx11-inheriting-ctors.cpp
>> cfe/trunk/test/SemaTemplate/cxx1z-using-declaration.cpp
>>
>> Modified: cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td
>> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/
>> Basic/DiagnosticSemaKinds.td?rev=291955&r1=291954&r2=291955&view=diff
>> ============================================================
>> ==================
>> --- cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td (original)
>> +++ cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td Fri Jan 13
>> 14:46:54 2017
>> @@ -3344,8 +3344,8 @@ def note_ovl_candidate : Note<"candidate
>> def note_ovl_candidate_inherited_constructor : Note<
>> "constructor from base class %0 inherited here">;
>> def note_ovl_candidate_inherited_constructor_slice : Note<
>> - "constructor inherited from base class cannot be used to initialize
>> from "
>> - "an argument of the derived class type">;
>> + "candidate %select{constructor|template}0 ignored: "
>> + "inherited constructor cannot be used to %select{copy|move}1
>> object">;
>> def note_ovl_candidate_illegal_constructor : Note<
>> "candidate %select{constructor|template}0 ignored: "
>> "instantiation %select{takes|would take}0 its own class type by
>> value">;
>>
>> Modified: cfe/trunk/lib/Sema/SemaOverload.cpp
>> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaO
>> verload.cpp?rev=291955&r1=291954&r2=291955&view=diff
>> ============================================================
>> ==================
>> --- cfe/trunk/lib/Sema/SemaOverload.cpp (original)
>> +++ cfe/trunk/lib/Sema/SemaOverload.cpp Fri Jan 13 14:46:54 2017
>> @@ -5944,6 +5944,28 @@ Sema::AddOverloadCandidate(FunctionDecl
>> Candidate.FailureKind = ovl_fail_illegal_constructor;
>> return;
>> }
>> +
>> + // C++ [over.match.funcs]p8: (proposed DR resolution)
>> + // A constructor inherited from class type C that has a first
>> parameter
>> + // of type "reference to P" (including such a constructor
>> instantiated
>> + // from a template) is excluded from the set of candidate
>> functions when
>> + // constructing an object of type cv D if the argument list has
>> exactly
>> + // one argument and D is reference-related to P and P is
>> reference-related
>> + // to C.
>> + auto *Shadow = dyn_cast<ConstructorUsingShado
>> wDecl>(FoundDecl.getDecl());
>> + if (Shadow && Args.size() == 1 && Constructor->getNumParams() >= 1 &&
>> + Constructor->getParamDecl(0)->getType()->isReferenceType()) {
>> + QualType P = Constructor->getParamDecl(0)->
>> getType()->getPointeeType();
>> + QualType C = Context.getRecordType(Constructor->getParent());
>> + QualType D = Context.getRecordType(Shadow->getParent());
>> + SourceLocation Loc = Args.front()->getExprLoc();
>> + if ((Context.hasSameUnqualifiedType(P, C) || IsDerivedFrom(Loc,
>> P, C)) &&
>> + (Context.hasSameUnqualifiedType(D, P) || IsDerivedFrom(Loc,
>> D, P))) {
>> + Candidate.Viable = false;
>> + Candidate.FailureKind = ovl_fail_inhctor_slice;
>> + return;
>> + }
>> + }
>> }
>>
>> unsigned NumParams = Proto->getNumParams();
>> @@ -6016,31 +6038,6 @@ Sema::AddOverloadCandidate(FunctionDecl
>> }
>> }
>>
>> - // C++ [over.best.ics]p4+: (proposed DR resolution)
>> - // If the target is the first parameter of an inherited constructor
>> when
>> - // constructing an object of type C with an argument list that has
>> exactly
>> - // one expression, an implicit conversion sequence cannot be formed
>> if C is
>> - // reference-related to the type that the argument would have after
>> the
>> - // application of the user-defined conversion (if any) and before
>> the final
>> - // standard conversion sequence.
>> - auto *Shadow = dyn_cast<ConstructorUsingShado
>> wDecl>(FoundDecl.getDecl());
>> - if (Shadow && Args.size() == 1 && !isa<InitListExpr>(Args.front())) {
>> - bool DerivedToBase, ObjCConversion, ObjCLifetimeConversion;
>> - QualType ConvertedArgumentType = Args.front()->getType();
>> - if (Candidate.Conversions[0].isUserDefined())
>> - ConvertedArgumentType =
>> - Candidate.Conversions[0].UserDefined.After.getFromType();
>> - if (CompareReferenceRelationship(Args.front()->getLocStart(),
>> - Context.getRecordType(Sh
>> adow->getParent()),
>> - ConvertedArgumentType,
>> DerivedToBase,
>> - ObjCConversion,
>> - ObjCLifetimeConversion) >=
>> Ref_Related) {
>> - Candidate.Viable = false;
>> - Candidate.FailureKind = ovl_fail_inhctor_slice;
>> - return;
>> - }
>> - }
>> -
>> if (EnableIfAttr *FailedAttr = CheckEnableIf(Function, Args)) {
>> Candidate.Viable = false;
>> Candidate.FailureKind = ovl_fail_enable_if;
>> @@ -10222,8 +10219,13 @@ static void NoteFunctionCandidate(Sema &
>> return DiagnoseOpenCLExtensionDisabled(S, Cand);
>>
>> case ovl_fail_inhctor_slice:
>> + // It's generally not interesting to note copy/move constructors
>> here.
>> + if (cast<CXXConstructorDecl>(Fn)->isCopyOrMoveConstructor())
>> + return;
>> S.Diag(Fn->getLocation(),
>> - diag::note_ovl_candidate_inherited_constructor_slice);
>> + diag::note_ovl_candidate_inherited_constructor_slice)
>> + << (Fn->getPrimaryTemplate() ? 1 : 0)
>> + << Fn->getParamDecl(0)->getType()->isRValueReferenceType();
>> MaybeEmitInheritedConstructorNote(S, Cand->FoundDecl);
>> return;
>>
>>
>> Modified: cfe/trunk/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/
>> p15.cpp
>> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CXX/dcl.
>> dcl/basic.namespace/namespace.udecl/p15.cpp?rev=291955&r1=
>> 291954&r2=291955&view=diff
>> ============================================================
>> ==================
>> --- cfe/trunk/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p15.cpp
>> (original)
>> +++ cfe/trunk/test/CXX/dcl.dcl/basic.namespace/namespace.udecl/p15.cpp
>> Fri Jan 13 14:46:54 2017
>> @@ -1,16 +1,16 @@
>> // RUN: %clang_cc1 -std=c++11 -verify %s
>>
>> -struct B1 { // expected-note 2{{candidate}}
>> +struct B1 {
>> B1(int); // expected-note {{candidate}}
>> };
>>
>> -struct B2 { // expected-note 2{{candidate}}
>> +struct B2 {
>> B2(int); // expected-note {{candidate}}
>> };
>>
>> struct D1 : B1, B2 { // expected-note 2{{candidate}}
>> - using B1::B1; // expected-note 3{{inherited here}}
>> - using B2::B2; // expected-note 3{{inherited here}}
>> + using B1::B1; // expected-note {{inherited here}}
>> + using B2::B2; // expected-note {{inherited here}}
>> };
>> D1 d1(0); // expected-error {{ambiguous}}
>>
>> @@ -35,7 +35,7 @@ namespace default_ctor {
>> operator D&&();
>> };
>>
>> - struct A { // expected-note 4{{candidate}}
>> + struct A { // expected-note 2{{candidate}}
>> A(); // expected-note {{candidate}}
>>
>> A(C &&); // expected-note {{candidate}}
>> @@ -47,7 +47,7 @@ namespace default_ctor {
>> A(convert_to_D2); // expected-note {{candidate}}
>> };
>>
>> - struct B { // expected-note 4{{candidate}}
>> + struct B { // expected-note 2{{candidate}}
>> B(); // expected-note {{candidate}}
>>
>> B(C &&); // expected-note {{candidate}}
>> @@ -66,9 +66,9 @@ namespace default_ctor {
>> using B::operator=;
>> };
>> struct D : A, B {
>> - using A::A; // expected-note 5{{inherited here}}
>> + using A::A; // expected-note 3{{inherited here}}
>> using A::operator=;
>> - using B::B; // expected-note 5{{inherited here}}
>> + using B::B; // expected-note 3{{inherited here}}
>> using B::operator=;
>>
>> D(int);
>> @@ -93,13 +93,13 @@ namespace default_ctor {
>> }
>>
>> struct Y;
>> - struct X { // expected-note 2{{candidate}}
>> + struct X {
>> X();
>> - X(volatile Y &); // expected-note {{constructor inherited from base
>> class cannot be used to initialize from an argument of the derived class
>> type}}
>> + X(volatile Y &); // expected-note 3{{inherited constructor cannot be
>> used to copy object}}
>> } x;
>> - struct Y : X { using X::X; } volatile y; // expected-note
>> 2{{candidate}}
>> - struct Z : Y { using Y::Y; } volatile z; // expected-note
>> 3{{candidate}} expected-note 5{{inherited here}}
>> - Z z1(x); // ok
>> - Z z2(y); // ok, Z is not reference-related to type of y
>> + struct Y : X { using X::X; } volatile y;
>> + struct Z : Y { using Y::Y; } volatile z; // expected-note 4{{no known
>> conversion}} expected-note 2{{would lose volatile}} expected-note
>> 3{{requires 0}} expected-note 3{{inherited here}}
>> + Z z1(x); // expected-error {{no match}}
>> + Z z2(y); // expected-error {{no match}}
>> Z z3(z); // expected-error {{no match}}
>> }
>>
>> Modified: cfe/trunk/test/CXX/dcl.decl/dcl.init/dcl.init.aggr/p1.cpp
>> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CXX/dcl.
>> decl/dcl.init/dcl.init.aggr/p1.cpp?rev=291955&r1=291954&
>> r2=291955&view=diff
>> ============================================================
>> ==================
>> --- cfe/trunk/test/CXX/dcl.decl/dcl.init/dcl.init.aggr/p1.cpp (original)
>> +++ cfe/trunk/test/CXX/dcl.decl/dcl.init/dcl.init.aggr/p1.cpp Fri Jan 13
>> 14:46:54 2017
>> @@ -134,13 +134,13 @@ ExplicitDefaultedAggr eda2{};
>>
>> struct DefaultedBase {
>> int n;
>> - DefaultedBase() = default; // expected-note 0+ {{candidate}}
>> - DefaultedBase(DefaultedBase const&) = default; // expected-note 0+
>> {{candidate}}
>> - DefaultedBase(DefaultedBase &&) = default; // expected-note 0+
>> {{candidate}}
>> + DefaultedBase() = default;
>> + DefaultedBase(DefaultedBase const&) = default;
>> + DefaultedBase(DefaultedBase &&) = default;
>> };
>>
>> struct InheritingConstructors : DefaultedBase { // expected-note 3
>> {{candidate}}
>> - using DefaultedBase::DefaultedBase; // expected-note 2 {{inherited
>> here}}
>> + using DefaultedBase::DefaultedBase;
>> };
>> InheritingConstructors ic = { 42 }; // expected-error {{no matching
>> constructor}}
>>
>>
>> Modified: cfe/trunk/test/CXX/drs/dr16xx.cpp
>> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CXX/drs/
>> dr16xx.cpp?rev=291955&r1=291954&r2=291955&view=diff
>> ============================================================
>> ==================
>> --- cfe/trunk/test/CXX/drs/dr16xx.cpp (original)
>> +++ cfe/trunk/test/CXX/drs/dr16xx.cpp Fri Jan 13 14:46:54 2017
>> @@ -71,14 +71,14 @@ namespace dr1638 { // dr1638: yes
>>
>> namespace dr1645 { // dr1645: 3.9
>> #if __cplusplus >= 201103L
>> - struct A { // expected-note 2{{candidate}}
>> + struct A {
>> constexpr A(int, float = 0); // expected-note 2{{candidate}}
>> explicit A(int, int = 0); // expected-note 2{{candidate}}
>> A(int, int, int = 0) = delete; // expected-note {{candidate}}
>> };
>>
>> struct B : A { // expected-note 2{{candidate}}
>> - using A::A; // expected-note 7{{inherited here}}
>> + using A::A; // expected-note 5{{inherited here}}
>> };
>>
>> constexpr B a(0); // expected-error {{ambiguous}}
>>
>> Modified: cfe/trunk/test/CXX/drs/dr19xx.cpp
>> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CXX/drs/
>> dr19xx.cpp?rev=291955&r1=291954&r2=291955&view=diff
>> ============================================================
>> ==================
>> --- cfe/trunk/test/CXX/drs/dr19xx.cpp (original)
>> +++ cfe/trunk/test/CXX/drs/dr19xx.cpp Fri Jan 13 14:46:54 2017
>> @@ -138,18 +138,21 @@ namespace dr1959 { // dr1959: 3.9
>> struct c;
>> struct a {
>> a() = default;
>> - a(const a &) = delete; // expected-note 2{{deleted}}
>> + a(const a &) = delete; // expected-note {{deleted}}
>> a(const b &) = delete; // not inherited
>> - a(c &&) = delete;
>> - template<typename T> a(T) = delete;
>> + a(c &&) = delete; // expected-note {{not viable}}
>> + template<typename T> a(T) = delete; // expected-note {{would take
>> its own class type by value}}
>> };
>>
>> - struct b : a { // expected-note {{copy constructor of 'b' is
>> implicitly deleted because base class 'dr1959::a' has a deleted copy
>> constructor}}
>> - using a::a;
>> + struct b : a { // expected-note {{cannot bind}} expected-note
>> {{deleted because}}
>> + using a::a; // expected-note 2{{inherited here}}
>> };
>>
>> a x;
>> - b y = x; // expected-error {{deleted}}
>> + // FIXME: As a resolution to an open DR against P0136R0, we disallow
>> + // use of inherited constructors to construct from a single argument
>> + // where the base class is reference-related to the argument type.
>> + b y = x; // expected-error {{no viable conversion}}
>> b z = z; // expected-error {{deleted}}
>>
>> struct c : a {
>> @@ -158,7 +161,7 @@ namespace dr1959 { // dr1959: 3.9
>> };
>> // FIXME: As a resolution to an open DR against P0136R0, we disallow
>> // use of inherited constructors to construct from a single argument
>> - // where the derived class is reference-related to its type.
>> + // where the base class is reference-related to the argument type.
>> c q(static_cast<c&&>(q));
>> #endif
>> }
>>
>> Modified: cfe/trunk/test/CXX/special/class.inhctor/p1.cpp
>> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CXX/speci
>> al/class.inhctor/p1.cpp?rev=291955&r1=291954&r2=291955&view=diff
>> ============================================================
>> ==================
>> --- cfe/trunk/test/CXX/special/class.inhctor/p1.cpp (original)
>> +++ cfe/trunk/test/CXX/special/class.inhctor/p1.cpp Fri Jan 13 14:46:54
>> 2017
>> @@ -3,7 +3,7 @@
>> // Note: [class.inhctor] was removed by P0136R1. This tests the new
>> behavior
>> // for the wording that used to be there.
>>
>> -struct A { // expected-note 8{{candidate is the implicit}}
>> +struct A { // expected-note 4{{candidate is the implicit}}
>> A(...); // expected-note 4{{candidate constructor}} expected-note
>> 4{{candidate inherited constructor}}
>> A(int = 0, int = 0, int = 0, int = 0, ...); // expected-note
>> 3{{candidate constructor}} expected-note 3{{candidate inherited
>> constructor}}
>> A(int = 0, int = 0, ...); // expected-note 3{{candidate constructor}}
>> expected-note 3{{candidate inherited constructor}}
>> @@ -15,7 +15,7 @@ struct A { // expected-note 8{{candidate
>> };
>>
>> struct B : A { // expected-note 4{{candidate is the implicit}}
>> - using A::A; // expected-note 19{{inherited here}}
>> + using A::A; // expected-note 15{{inherited here}}
>> B(void*);
>> };
>>
>>
>> Modified: cfe/trunk/test/CXX/special/class.inhctor/p3.cpp
>> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CXX/speci
>> al/class.inhctor/p3.cpp?rev=291955&r1=291954&r2=291955&view=diff
>> ============================================================
>> ==================
>> --- cfe/trunk/test/CXX/special/class.inhctor/p3.cpp (original)
>> +++ cfe/trunk/test/CXX/special/class.inhctor/p3.cpp Fri Jan 13 14:46:54
>> 2017
>> @@ -14,21 +14,21 @@ D1 d1a(1), d1b(1, 1);
>>
>> D1 fd1() { return 1; }
>>
>> -struct B2 { // expected-note 2{{candidate}}
>> +struct B2 {
>> explicit B2(int, int = 0, int = 0);
>> };
>> struct D2 : B2 { // expected-note 2{{candidate constructor}}
>> - using B2::B2; // expected-note 2{{inherited here}}
>> + using B2::B2;
>> };
>> D2 d2a(1), d2b(1, 1), d2c(1, 1, 1);
>>
>> D2 fd2() { return 1; } // expected-error {{no viable conversion}}
>>
>> -struct B3 { // expected-note 2{{candidate}}
>> +struct B3 {
>> B3(void*); // expected-note {{candidate}}
>> };
>> struct D3 : B3 { // expected-note 2{{candidate constructor}}
>> - using B3::B3; // expected-note 3{{inherited here}}
>> + using B3::B3; // expected-note {{inherited here}}
>> };
>> D3 fd3() { return 1; } // expected-error {{no viable conversion}}
>>
>>
>> Modified: cfe/trunk/test/CXX/special/class.inhctor/p7.cpp
>> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CXX/speci
>> al/class.inhctor/p7.cpp?rev=291955&r1=291954&r2=291955&view=diff
>> ============================================================
>> ==================
>> --- cfe/trunk/test/CXX/special/class.inhctor/p7.cpp (original)
>> +++ cfe/trunk/test/CXX/special/class.inhctor/p7.cpp Fri Jan 13 14:46:54
>> 2017
>> @@ -3,15 +3,15 @@
>> // Note: [class.inhctor] was removed by P0136R1. This tests the new
>> behavior
>> // for the wording that used to be there.
>>
>> -struct B1 { // expected-note 2{{candidate}}
>> +struct B1 {
>> B1(int); // expected-note {{candidate}}
>> };
>> -struct B2 { // expected-note 2{{candidate}}
>> +struct B2 {
>> B2(int); // expected-note {{candidate}}
>> };
>> struct D1 : B1, B2 { // expected-note 2{{candidate}}
>> - using B1::B1; // expected-note 3{{inherited here}}
>> - using B2::B2; // expected-note 3{{inherited here}}
>> + using B1::B1; // expected-note {{inherited here}}
>> + using B2::B2; // expected-note {{inherited here}}
>> };
>> struct D2 : B1, B2 {
>> using B1::B1;
>>
>> Modified: cfe/trunk/test/SemaCXX/cxx11-inheriting-ctors.cpp
>> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/
>> cxx11-inheriting-ctors.cpp?rev=291955&r1=291954&r2=291955&view=diff
>> ============================================================
>> ==================
>> --- cfe/trunk/test/SemaCXX/cxx11-inheriting-ctors.cpp (original)
>> +++ cfe/trunk/test/SemaCXX/cxx11-inheriting-ctors.cpp Fri Jan 13
>> 14:46:54 2017
>> @@ -56,9 +56,9 @@ namespace InvalidConstruction {
>> }
>>
>> namespace ExplicitConv {
>> - struct B {}; // expected-note 2{{candidate}}
>> + struct B {};
>> struct D : B { // expected-note 3{{candidate}}
>> - using B::B; // expected-note 2{{inherited}}
>> + using B::B;
>> };
>> struct X { explicit operator B(); } x;
>> struct Y { explicit operator D(); } y;
>> @@ -68,19 +68,40 @@ namespace ExplicitConv {
>> }
>>
>> namespace NestedListInit {
>> - struct B { B(); } b; // expected-note 5{{candidate}}
>> - struct D : B { // expected-note 3{{candidate}}
>> - using B::B; // expected-note 2{{inherited}}
>> + struct B { B(); } b; // expected-note 3{{candidate}}
>> + struct D : B { // expected-note 14{{not viable}}
>> + using B::B;
>> };
>> // This is a bit weird. We're allowed one pair of braces for overload
>> // resolution, and one more pair of braces due to [over.ics.list]/2.
>> B b1 = {b};
>> B b2 = {{b}};
>> B b3 = {{{b}}}; // expected-error {{no match}}
>> - // This is the same, but we get one call to D's version of B::B(const
>> B&)
>> - // before the two permitted calls to D::D(D&&).
>> - D d1 = {b};
>> - D d2 = {{b}};
>> - D d3 = {{{b}}};
>> + // Per a proposed defect resolution, we don't get to call
>> + // D's version of B::B(const B&) here.
>> + D d0 = b; // expected-error {{no viable conversion}}
>> + D d1 = {b}; // expected-error {{no match}}
>> + D d2 = {{b}}; // expected-error {{no match}}
>> + D d3 = {{{b}}}; // expected-error {{no match}}
>> D d4 = {{{{b}}}}; // expected-error {{no match}}
>> }
>> +
>> +namespace PR31606 {
>> + // PR31606: as part of a proposed defect resolution, do not consider
>> + // inherited constructors that would be copy constructors for any class
>> + // between the declaring class and the constructed class (inclusive).
>> + struct Base {};
>> +
>> + struct A : Base {
>> + using Base::Base;
>> + bool operator==(A const &) const; // expected-note {{no known
>> conversion from 'PR31606::B' to 'const PR31606::A' for 1st argument}}
>> + };
>> +
>> + struct B : Base {
>> + using Base::Base;
>> + };
>> +
>> + bool a = A{} == A{};
>> + // Note, we do *not* allow operator=='s argument to use the inherited
>> A::A(Base&&) constructor to construct from B{}.
>> + bool b = A{} == B{}; // expected-error {{invalid operands}}
>> +}
>>
>> Modified: cfe/trunk/test/SemaTemplate/cxx1z-using-declaration.cpp
>> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaTempl
>> ate/cxx1z-using-declaration.cpp?rev=291955&r1=291954&r2=291955&view=diff
>> ============================================================
>> ==================
>> --- cfe/trunk/test/SemaTemplate/cxx1z-using-declaration.cpp (original)
>> +++ cfe/trunk/test/SemaTemplate/cxx1z-using-declaration.cpp Fri Jan 13
>> 14:46:54 2017
>> @@ -17,7 +17,7 @@ void test_Unexpanded() {
>>
>> // Test using non-type members from pack of base classes.
>> template<typename ...T> struct A : T... { // expected-note 2{{candidate}}
>> - using T::T ...; // expected-note 6{{inherited here}}
>> + using T::T ...; // expected-note 2{{inherited here}}
>> using T::operator() ...;
>> using T::operator T* ...;
>> using T::h ...;
>> @@ -29,7 +29,7 @@ template<typename ...T> struct A : T...
>> };
>>
>> namespace test_A {
>> - struct X { // expected-note 2{{candidate}}
>> + struct X {
>> X();
>> X(int); // expected-note {{candidate}}
>> void operator()(int); // expected-note 2{{candidate}}
>> @@ -43,7 +43,7 @@ namespace test_A {
>> operator Y *();
>> void h(int, int); // expected-note {{not viable}}
>> };
>> - struct Z { // expected-note 2{{candidate}}
>> + struct Z {
>> Z();
>> Z(int); // expected-note {{candidate}}
>> void operator()(int); // expected-note 2{{candidate}}
>>
>>
>> _______________________________________________
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>> cfe-commits@lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
>>
>>
>>
>
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