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llvm-project/clang/test/SemaTemplate/aggregate-deduction-candidate.cpp
Matheus Izvekov 91cdd35008
[clang] Improve nested name specifier AST representation (#147835) 
This is a major change on how we represent nested name qualifications in
the AST.

* The nested name specifier itself and how it's stored is changed. The
prefixes for types are handled within the type hierarchy, which makes
canonicalization for them super cheap, no memory allocation required.
Also translating a type into nested name specifier form becomes a no-op.
An identifier is stored as a DependentNameType. The nested name
specifier gains a lightweight handle class, to be used instead of
passing around pointers, which is similar to what is implemented for
TemplateName. There is still one free bit available, and this handle can
be used within a PointerUnion and PointerIntPair, which should keep
bit-packing aficionados happy.
* The ElaboratedType node is removed, all type nodes in which it could
previously apply to can now store the elaborated keyword and name
qualifier, tail allocating when present.
* TagTypes can now point to the exact declaration found when producing
these, as opposed to the previous situation of there only existing one
TagType per entity. This increases the amount of type sugar retained,
and can have several applications, for example in tracking module
ownership, and other tools which care about source file origins, such as
IWYU. These TagTypes are lazily allocated, in order to limit the
increase in AST size.

This patch offers a great performance benefit.

It greatly improves compilation time for
[stdexec](https://github.com/NVIDIA/stdexec). For one datapoint, for
`test_on2.cpp` in that project, which is the slowest compiling test,
this patch improves `-c` compilation time by about 7.2%, with the
`-fsyntax-only` improvement being at ~12%.

This has great results on compile-time-tracker as well:

![image](https://github.com/user-attachments/assets/700dce98-2cab-4aa8-97d1-b038c0bee831)

This patch also further enables other optimziations in the future, and
will reduce the performance impact of template specialization resugaring
when that lands.

It has some other miscelaneous drive-by fixes.

About the review: Yes the patch is huge, sorry about that. Part of the
reason is that I started by the nested name specifier part, before the
ElaboratedType part, but that had a huge performance downside, as
ElaboratedType is a big performance hog. I didn't have the steam to go
back and change the patch after the fact.

There is also a lot of internal API changes, and it made sense to remove
ElaboratedType in one go, versus removing it from one type at a time, as
that would present much more churn to the users. Also, the nested name
specifier having a different API avoids missing changes related to how
prefixes work now, which could make existing code compile but not work.

How to review: The important changes are all in
`clang/include/clang/AST` and `clang/lib/AST`, with also important
changes in `clang/lib/Sema/TreeTransform.h`.

The rest and bulk of the changes are mostly consequences of the changes
in API.

PS: TagType::getDecl is renamed to `getOriginalDecl` in this patch, just
for easier to rebasing. I plan to rename it back after this lands.

Fixes #136624
Fixes https://github.com/llvm/llvm-project/issues/43179
Fixes https://github.com/llvm/llvm-project/issues/68670
Fixes https://github.com/llvm/llvm-project/issues/92757
2025-08-09 05:06:53 -03:00

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// RUN: %clang_cc1 -std=c++17 -verify=expected,cxx17 %s
// RUN: %clang_cc1 -std=c++20 -verify=expected,cxx20 -ast-dump -ast-dump-decl-types -ast-dump-filter "deduction guide" %s | FileCheck %s --strict-whitespace
namespace Basic {
template<class T> struct A { // cxx17-note 6 {{candidate}} cxx17-note 6 {{implicit deduction guide}}
T x;
T y;
};
A a1 = {3.0, 4.0}; // cxx17-error {{no viable}}
A a2 = {.x = 3.0, .y = 4.0}; // cxx17-error {{no viable}}
A a3(3.0, 4.0); // cxx17-error {{no viable}}
// CHECK-LABEL: Dumping Basic::<deduction guide for A>:
// CHECK: FunctionTemplateDecl {{.*}} implicit <deduction guide for A>
// CHECK: |-TemplateTypeParmDecl {{.*}} referenced class depth 0 index 0 T
// CHECK: |-CXXDeductionGuideDecl {{.*}} implicit <deduction guide for A> 'auto (T, T) -> Basic::A<T>'
// CHECK: | |-ParmVarDecl {{.*}} 'T'
// CHECK: | `-ParmVarDecl {{.*}} 'T'
// CHECK: `-CXXDeductionGuideDecl {{.*}} implicit used <deduction guide for A> 'auto (double, double) -> Basic::A<double>'
// CHECK: |-TemplateArgument type 'double'
// CHECK: | `-BuiltinType {{.*}} 'double'
// CHECK: |-ParmVarDecl {{.*}} 'double'
// CHECK: `-ParmVarDecl {{.*}} 'double'
// CHECK: FunctionProtoType {{.*}} 'auto (T, T) -> Basic::A<T>' dependent trailing_return cdecl
// CHECK: |-InjectedClassNameType {{.*}} 'Basic::A<T>' dependent
// CHECK: | `-CXXRecord {{.*}} 'A'
// CHECK: |-TemplateTypeParmType {{.*}} 'T' dependent depth 0 index 0
// CHECK: | `-TemplateTypeParm {{.*}} 'T'
// CHECK: `-TemplateTypeParmType {{.*}} 'T' dependent depth 0 index 0
// CHECK: `-TemplateTypeParm {{.*}} 'T'
template <typename T> struct S { // cxx20-note 2 {{candidate}}
T x;
T y;
};
template <typename T> struct C { // cxx20-note 10 {{candidate}} cxx17-note 12 {{candidate}} \
cxx20-note 10 {{implicit deduction guide}} cxx17-note 12 {{implicit deduction guide}}
S<T> s;
T t;
};
template <typename T> struct D { // cxx20-note 6 {{candidate}} cxx17-note 8 {{candidate}} \
cxx20-note 6 {{implicit deduction guide}} cxx17-note 8 {{implicit deduction guide}}
S<int> s;
T t;
};
C c1 = {1, 2}; // expected-error {{no viable}}
C c2 = {1, 2, 3}; // expected-error {{no viable}}
C c3 = {{1u, 2u}, 3}; // cxx17-error {{no viable}}
C c4(1, 2); // expected-error {{no viable}}
C c5(1, 2, 3); // expected-error {{no viable}}
C c6({1u, 2u}, 3); // cxx17-error {{no viable}}
D d1 = {1, 2}; // expected-error {{no viable}}
D d2 = {1, 2, 3}; // cxx17-error {{no viable}}
D d3(1, 2); // expected-error {{no viable}}
// CTAD succeed but brace elision is not allowed for parenthesized aggregate init.
D d4(1, 2, 3); // expected-error {{no viable}}
// CHECK-LABEL: Dumping Basic::<deduction guide for C>:
// CHECK: FunctionTemplateDecl {{.*}} implicit <deduction guide for C>
// CHECK: |-TemplateTypeParmDecl {{.*}} referenced typename depth 0 index 0 T
// CHECK: |-CXXDeductionGuideDecl {{.*}} implicit <deduction guide for C> 'auto (S<T>, T) -> Basic::C<T>'
// CHECK: | |-ParmVarDecl {{.*}} 'S<T>'
// CHECK: | `-ParmVarDecl {{.*}} 'T'
// CHECK: `-CXXDeductionGuideDecl {{.*}} implicit used <deduction guide for C> 'auto (S<int>, int) -> Basic::C<int>'
// CHECK: |-TemplateArgument type 'int'
// CHECK: | `-BuiltinType {{.*}} 'int'
// CHECK: |-ParmVarDecl {{.*}} 'S<int>':'Basic::S<int>'
// CHECK: `-ParmVarDecl {{.*}} 'int'
// CHECK: FunctionProtoType {{.*}} 'auto (S<T>, T) -> Basic::C<T>' dependent trailing_return cdecl
// CHECK: |-InjectedClassNameType {{.*}} 'Basic::C<T>' dependent
// CHECK: | `-CXXRecord {{.*}} 'C'
// CHECK: |-TemplateSpecializationType {{.*}} 'S<T>' dependent
// CHECK: | `-TemplateArgument type 'T'
// CHECK: | `-TemplateTypeParmType {{.*}} 'T' dependent depth 0 index 0
// CHECK: | `-TemplateTypeParm {{.*}} 'T'
// CHECK: `-TemplateTypeParmType {{.*}} 'T' dependent depth 0 index 0
// CHECK: `-TemplateTypeParm {{.*}} 'T'
// CHECK-LABEL: Dumping Basic::<deduction guide for D>:
// CHECK: FunctionTemplateDecl {{.*}} implicit <deduction guide for D>
// CHECK: |-TemplateTypeParmDecl {{.*}} referenced typename depth 0 index 0 T
// CHECK: `-CXXDeductionGuideDecl {{.*}} implicit <deduction guide for D> 'auto (int, int) -> Basic::D<T>'
// CHECK: |-ParmVarDecl {{.*}} 'int'
// CHECK: `-ParmVarDecl {{.*}} 'int'
// CHECK: FunctionProtoType {{.*}} 'auto (int, int) -> Basic::D<T>' dependent trailing_return cdecl
// CHECK: |-InjectedClassNameType {{.*}} 'Basic::D<T>' dependent
// CHECK: | `-CXXRecord {{.*}} 'D'
// CHECK: |-SubstTemplateTypeParmType {{.*}} 'int' sugar typename depth 0 index 0 T
// CHECK: | |-ClassTemplateSpecialization {{.*}} 'S'
// CHECK: | `-BuiltinType {{.*}} 'int'
// CHECK: `-SubstTemplateTypeParmType {{.*}} 'int' sugar typename depth 0 index 0 T
// CHECK: |-ClassTemplateSpecialization {{.*}} 'S'
// CHECK: `-BuiltinType {{.*}} 'int'
template <typename T> struct E { // cxx17-note 4 {{candidate}} cxx17-note 4 {{implicit deduction guide}}
T t;
decltype(t) t2;
};
E e1 = {1, 2}; // cxx17-error {{no viable}}
E e2(1, 2); // cxx17-error {{no viable}}
// CHECK-LABEL: Dumping Basic::<deduction guide for E>:
// CHECK: FunctionTemplateDecl {{.*}} implicit <deduction guide for E>
// CHECK: |-TemplateTypeParmDecl {{.*}} referenced typename depth 0 index 0 T
// CHECK: |-CXXDeductionGuideDecl {{.*}} implicit <deduction guide for E> 'auto (T, decltype(t)) -> Basic::E<T>'
// CHECK: | |-ParmVarDecl {{.*}} 'T'
// CHECK: | `-ParmVarDecl {{.*}} 'decltype(t)'
// CHECK: `-CXXDeductionGuideDecl {{.*}} implicit used <deduction guide for E> 'auto (int, decltype(t)) -> Basic::E<int>'
// CHECK: |-TemplateArgument type 'int'
// CHECK: | `-BuiltinType {{.*}} 'int'
// CHECK: |-ParmVarDecl {{.*}} 'int'
// CHECK: `-ParmVarDecl {{.*}} 'decltype(t)':'int'
// CHECK: FunctionProtoType {{.*}} 'auto (T, decltype(t)) -> Basic::E<T>' dependent trailing_return cdecl
// CHECK: |-InjectedClassNameType {{.*}} 'Basic::E<T>' dependent
// CHECK: | `-CXXRecord {{.*}} 'E'
// CHECK: |-TemplateTypeParmType {{.*}} 'T' dependent depth 0 index 0
// CHECK: | `-TemplateTypeParm {{.*}} 'T'
// CHECK: `-DecltypeType {{.*}} 'decltype(t)' dependent
// CHECK: `-DeclRefExpr {{.*}} 'T' lvalue Field {{.*}} 't' 'T' non_odr_use_unevaluated
template <typename T>
struct I {
using type = T;
};
template <typename T>
struct F { // cxx17-note 2 {{candidate}} cxx17-note 2 {{implicit deduction guide}}
typename I<T>::type i;
T t;
};
F f1 = {1, 2}; // cxx17-error {{no viable}}
// CHECK-LABEL: Dumping Basic::<deduction guide for F>:
// CHECK: FunctionTemplateDecl {{.*}} implicit <deduction guide for F>
// CHECK: |-TemplateTypeParmDecl {{.*}} referenced typename depth 0 index 0 T
// CHECK: |-CXXDeductionGuideDecl {{.*}} implicit <deduction guide for F> 'auto (typename I<T>::type, T) -> Basic::F<T>'
// CHECK: | |-ParmVarDecl {{.*}} 'typename I<T>::type'
// CHECK: | `-ParmVarDecl {{.*}} 'T'
// CHECK: `-CXXDeductionGuideDecl {{.*}} implicit used <deduction guide for F> 'auto (typename I<int>::type, int) -> Basic::F<int>'
// CHECK: |-TemplateArgument type 'int'
// CHECK: | `-BuiltinType {{.*}} 'int'
// CHECK: |-ParmVarDecl {{.*}} 'typename I<int>::type':'int'
// CHECK: `-ParmVarDecl {{.*}} 'int'
// CHECK: FunctionProtoType {{.*}} 'auto (typename I<T>::type, T) -> Basic::F<T>' dependent trailing_return cdecl
// CHECK: |-InjectedClassNameType {{.*}} 'Basic::F<T>' dependent
// CHECK: | `-CXXRecord {{.*}} 'F'
// CHECK: |-DependentNameType {{.*}} 'typename I<T>::type' dependent
// CHECK: `-TemplateTypeParmType {{.*}} 'T' dependent depth 0 index 0
// CHECK: `-TemplateTypeParm {{.*}} 'T'
}
namespace Array {
typedef unsigned long size_t;
template <typename T, size_t N> struct A { // cxx20-note 2 {{candidate}} cxx17-note 14 {{candidate}} \
cxx20-note 2 {{implicit deduction guide}} cxx17-note 14 {{implicit deduction guide}}
T array[N];
};
A a1 = {{1, 2, 3}}; // cxx17-error {{no viable}}
A a2 = {1, 2, 3}; // expected-error {{no viable}}
A a3 = {"meow"}; // cxx17-error {{no viable}}
A a4 = {("meow")}; // cxx17-error {{no viable}}
A a5({1, 2, 3}); // cxx17-error {{no viable}}
A a6("meow"); // cxx17-error {{no viable}}
A a7(("meow")); // cxx17-error {{no viable}}
// CHECK-LABEL: Dumping Array::<deduction guide for A>:
// CHECK: FunctionTemplateDecl {{.*}} implicit <deduction guide for A>
// CHECK: |-TemplateTypeParmDecl {{.*}} referenced typename depth 0 index 0 T
// CHECK: |-NonTypeTemplateParmDecl {{.*}} 'size_t':'unsigned {{.*}}' depth 0 index 1 N
// CHECK: |-CXXDeductionGuideDecl {{.*}} implicit <deduction guide for A> 'auto (T (&&)[N]) -> Array::A<T, N>'
// CHECK: | `-ParmVarDecl {{.*}} 'T (&&)[N]'
// CHECK: `-CXXDeductionGuideDecl {{.*}} implicit used <deduction guide for A> 'auto (int (&&)[3]) -> Array::A<int, 3>'
// CHECK: |-TemplateArgument type 'int'
// CHECK: | `-BuiltinType {{.*}} 'int'
// CHECK: |-TemplateArgument integral '3UL'
// CHECK: `-ParmVarDecl {{.*}} 'int (&&)[3]'
// CHECK: FunctionProtoType {{.*}} 'auto (T (&&)[N]) -> Array::A<T, N>' dependent trailing_return cdecl
// CHECK: |-InjectedClassNameType {{.*}} 'Array::A<T, N>' dependent
// CHECK: | `-CXXRecord {{.*}} 'A'
// CHECK: `-RValueReferenceType {{.*}} 'T (&&)[N]' dependent
// CHECK: `-DependentSizedArrayType {{.*}} 'T[N]' dependent
// CHECK: |-TemplateTypeParmType {{.*}} 'T' dependent depth 0 index 0
// CHECK: | `-TemplateTypeParm {{.*}} 'T'
// CHECK: `-DeclRefExpr {{.*}} 'size_t':'unsigned {{.*}}' NonTypeTemplateParm {{.*}} 'N' 'size_t':'unsigned {{.*}}'
// CHECK: Dumping Array::<deduction guide for A>:
// CHECK: FunctionTemplateDecl {{.*}} implicit <deduction guide for A>
// CHECK: |-TemplateTypeParmDecl {{.*}} referenced typename depth 0 index 0 T
// CHECK: |-NonTypeTemplateParmDecl {{.*}} 'size_t':'unsigned {{.*}}' depth 0 index 1 N
// CHECK: |-CXXDeductionGuideDecl {{.*}} implicit <deduction guide for A> 'auto (const T (&)[N]) -> Array::A<T, N>'
// CHECK: | `-ParmVarDecl {{.*}} 'const T (&)[N]'
// CHECK: `-CXXDeductionGuideDecl {{.*}} implicit used <deduction guide for A> 'auto (const char (&)[5]) -> Array::A<char, 5>'
// CHECK: |-TemplateArgument type 'char'
// CHECK: | `-BuiltinType {{.*}} 'char'
// CHECK: |-TemplateArgument integral '5UL'
// CHECK: `-ParmVarDecl {{.*}} 'const char (&)[5]'
// CHECK: FunctionProtoType {{.*}} 'auto (const T (&)[N]) -> Array::A<T, N>' dependent trailing_return cdecl
// CHECK: |-InjectedClassNameType {{.*}} 'Array::A<T, N>' dependent
// CHECK: | `-CXXRecord {{.*}} 'A'
// CHECK: `-LValueReferenceType {{.*}} 'const T (&)[N]' dependent
// CHECK: `-QualType {{.*}} 'const T[N]' const
// CHECK: `-DependentSizedArrayType {{.*}} 'T[N]' dependent
// CHECK: |-TemplateTypeParmType {{.*}} 'T' dependent depth 0 index 0
// CHECK: | `-TemplateTypeParm {{.*}} 'T'
// CHECK: `-DeclRefExpr {{.*}} 'size_t':'unsigned{{.*}}' NonTypeTemplateParm {{.*}} 'N' 'size_t':'unsigned{{.*}}'
}
namespace BraceElision {
template <typename T> struct A { // cxx17-note 4 {{candidate}} cxx17-note 4 {{implicit deduction guide}}
T array[2];
};
A a1 = {0, 1}; // cxx17-error {{no viable}}
// CTAD succeed but brace elision is not allowed for parenthesized aggregate init.
A a2(0, 1); // cxx20-error {{array initializer must be an initializer list}} cxx17-error {{no viable}}
// CHECK-LABEL: Dumping BraceElision::<deduction guide for A>:
// CHECK: FunctionTemplateDecl {{.*}} implicit <deduction guide for A>
// CHECK: |-TemplateTypeParmDecl {{.*}} referenced typename depth 0 index 0 T
// CHECK: |-CXXDeductionGuideDecl {{.*}} implicit <deduction guide for A> 'auto (T, T) -> BraceElision::A<T>'
// CHECK: | |-ParmVarDecl {{.*}} 'T'
// CHECK: | `-ParmVarDecl {{.*}} 'T'
// CHECK: `-CXXDeductionGuideDecl {{.*}} implicit used <deduction guide for A> 'auto (int, int) -> BraceElision::A<int>'
// CHECK: |-TemplateArgument type 'int'
// CHECK: | `-BuiltinType {{.*}} 'int'
// CHECK: |-ParmVarDecl {{.*}} 'int'
// CHECK: `-ParmVarDecl {{.*}} 'int'
// CHECK: FunctionProtoType {{.*}} 'auto (T, T) -> BraceElision::A<T>' dependent trailing_return cdecl
// CHECK: |-InjectedClassNameType {{.*}} 'BraceElision::A<T>' dependent
// CHECK: | `-CXXRecord {{.*}} 'A'
// CHECK: |-TemplateTypeParmType {{.*}} 'T' dependent depth 0 index 0
// CHECK: | `-TemplateTypeParm {{.*}} 'T'
// CHECK: `-TemplateTypeParmType {{.*}} 'T' dependent depth 0 index 0
// CHECK: `-TemplateTypeParm {{.*}} 'T'
}
namespace TrailingPack {
template<typename... T> struct A : T... { // cxx17-note 4 {{candidate}} cxx17-note 4 {{implicit deduction guide}}
};
A a1 = { // cxx17-error {{no viable}}
[]{ return 1; },
[]{ return 2; }
};
A a2( // cxx17-error {{no viable}}
[]{ return 1; },
[]{ return 2; }
);
// CHECK-LABEL: Dumping TrailingPack::<deduction guide for A>:
// CHECK: FunctionTemplateDecl {{.*}} implicit <deduction guide for A>
// CHECK: |-TemplateTypeParmDecl {{.*}} referenced typename depth 0 index 0 ... T
// CHECK: |-CXXDeductionGuideDecl {{.*}} implicit <deduction guide for A> 'auto (T...) -> TrailingPack::A<T...>'
// CHECK: | `-ParmVarDecl {{.*}} 'T...' pack
// CHECK: `-CXXDeductionGuideDecl {{.*}} implicit used <deduction guide for A>
// CHECK-SAME: 'auto (TrailingPack::(lambda at {{.*}}), TrailingPack::(lambda at {{.*}})) ->
// CHECK-SAME: TrailingPack::A<TrailingPack::(lambda at {{.*}}), TrailingPack::(lambda at {{.*}})>'
// CHECK: |-TemplateArgument pack
// CHECK: | |-TemplateArgument type 'TrailingPack::(lambda at {{.*}})'
// CHECK: | | `-RecordType {{.*}} 'TrailingPack::(lambda at {{.*}})'
// CHECK: | | `-CXXRecord {{.*}} <line:261:5>
// CHECK: | `-TemplateArgument type 'TrailingPack::(lambda at {{.*}})'
// CHECK: | `-RecordType {{.*}} 'TrailingPack::(lambda at {{.*}})'
// CHECK: | `-CXXRecord {{.*}} <line:262:5>
// CHECK: |-ParmVarDecl {{.*}} 'TrailingPack::(lambda at {{.*}})'
// CHECK: `-ParmVarDecl {{.*}} 'TrailingPack::(lambda at {{.*}})'
// CHECK: FunctionProtoType {{.*}} 'auto (T...) -> TrailingPack::A<T...>' dependent trailing_return cdecl
// CHECK: |-InjectedClassNameType {{.*}} 'TrailingPack::A<T...>' dependent
// CHECK: | `-CXXRecord {{.*}} 'A'
// CHECK: `-PackExpansionType {{.*}} 'T...' dependent
// CHECK: `-TemplateTypeParmType {{.*}} 'T' dependent contains_unexpanded_pack depth 0 index 0 pack
// CHECK: `-TemplateTypeParm {{.*}} 'T'
}
namespace NonTrailingPack {
template<typename... T> struct A : T... { // expected-note 4 {{candidate}} expected-note 4 {{implicit deduction guide}}
int a;
};
A a1 = { // expected-error {{no viable}}
[]{ return 1; },
[]{ return 2; }
};
A a2( // expected-error {{no viable}}
[]{ return 1; },
[]{ return 2; }
);
}
namespace DeduceArity {
template <typename... T> struct Types {};
template <typename... T> struct F : Types<T...>, T... {}; // cxx20-note 12 {{candidate}} cxx17-note 16 {{candidate}} \
cxx20-note 12 {{implicit deduction guide}} cxx17-note 16 {{implicit deduction guide}}
struct X {};
struct Y {};
struct Z {};
struct W { operator Y(); };
F f1 = {Types<X, Y, Z>{}, {}, {}}; // cxx17-error {{no viable}}
F f2 = {Types<X, Y, Z>{}, X{}, Y{}}; // cxx17-error {{no viable}}
F f3 = {Types<X, Y, Z>{}, X{}, W{}}; // expected-error {{no viable}}
F f4 = {Types<X>{}, {}, {}}; // expected-error {{no viable}}
F f5(Types<X, Y, Z>{}, {}, {}); // cxx17-error {{no viable}}
F f6(Types<X, Y, Z>{}, X{}, Y{}); // cxx17-error {{no viable}}
F f7(Types<X, Y, Z>{}, X{}, W{}); // expected-error {{no viable}}
F f8(Types<X>{}, {}, {}); // expected-error {{no viable}}
// CHECK-LABEL: Dumping DeduceArity::<deduction guide for F>:
// CHECK: FunctionTemplateDecl {{.*}} implicit <deduction guide for F>
// CHECK: |-TemplateTypeParmDecl {{.*}} referenced typename depth 0 index 0 ... T
// CHECK: |-CXXDeductionGuideDecl {{.*}} implicit <deduction guide for F> 'auto (Types<T...>, T...) -> DeduceArity::F<T...>'
// CHECK: | |-ParmVarDecl {{.*}} 'Types<T...>'
// CHECK: | `-ParmVarDecl {{.*}} 'T...' pack
// CHECK: |-CXXDeductionGuideDecl {{.*}} implicit used <deduction guide for F>
// CHECK-SAME: 'auto (Types<DeduceArity::X, DeduceArity::Y, DeduceArity::Z>, DeduceArity::X, DeduceArity::Y, DeduceArity::Z) ->
// CHECK-SAME: DeduceArity::F<DeduceArity::X, DeduceArity::Y, DeduceArity::Z>'
// CHECK: | |-TemplateArgument pack
// CHECK: | | |-TemplateArgument type 'DeduceArity::X'
// CHECK: | | | `-RecordType {{.*}} 'DeduceArity::X'
// CHECK: | | | `-CXXRecord {{.*}} 'X'
// CHECK: | | |-TemplateArgument type 'DeduceArity::Y'
// CHECK: | | | `-RecordType {{.*}} 'DeduceArity::Y'
// CHECK: | | | `-CXXRecord {{.*}} 'Y'
// CHECK: | | `-TemplateArgument type 'DeduceArity::Z'
// CHECK: | | `-RecordType {{.*}} 'DeduceArity::Z'
// CHECK: | | `-CXXRecord {{.*}} 'Z'
// CHECK: | |-ParmVarDecl {{.*}} 'Types<DeduceArity::X, DeduceArity::Y, DeduceArity::Z>':'DeduceArity::Types<DeduceArity::X, DeduceArity::Y, DeduceArity::Z>'
// CHECK: | |-ParmVarDecl {{.*}} 'DeduceArity::X'
// CHECK: | |-ParmVarDecl {{.*}} 'DeduceArity::Y'
// CHECK: | `-ParmVarDecl {{.*}} 'DeduceArity::Z'
// CHECK: `-CXXDeductionGuideDecl {{.*}} implicit <deduction guide for F> 'auto (Types<DeduceArity::X>, DeduceArity::X) -> DeduceArity::F<DeduceArity::X>'
// CHECK: |-TemplateArgument pack
// CHECK: | `-TemplateArgument type 'DeduceArity::X'
// CHECK: | `-RecordType {{.*}} 'DeduceArity::X'
// CHECK: | `-CXXRecord {{.*}} 'X'
// CHECK: |-ParmVarDecl {{.*}} 'Types<DeduceArity::X>':'DeduceArity::Types<DeduceArity::X>'
// CHECK: `-ParmVarDecl {{.*}} 'DeduceArity::X'
// CHECK: FunctionProtoType {{.*}} 'auto (Types<T...>, T...) -> DeduceArity::F<T...>' dependent trailing_return cdecl
// CHECK: |-InjectedClassNameType {{.*}} 'DeduceArity::F<T...>' dependent
// CHECK: | `-CXXRecord {{.*}} 'F'
// CHECK: |-TemplateSpecializationType {{.*}} 'Types<T...>' dependent
// CHECK: | `-TemplateArgument type 'T...'
// CHECK: | `-PackExpansionType {{.*}} 'T...' dependent
// CHECK: | `-TemplateTypeParmType {{.*}} 'T' dependent contains_unexpanded_pack depth 0 index 0 pack
// CHECK: | `-TemplateTypeParm {{.*}} 'T'
// CHECK: `-PackExpansionType {{.*}} 'T...' dependent
// CHECK: `-TemplateTypeParmType {{.*}} 'T' dependent contains_unexpanded_pack depth 0 index 0 pack
// CHECK: `-TemplateTypeParm {{.*}} 'T'
}
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