// RUN: %clang_cc1 -std=c++17 -triple x86_64-unknown-unknown -ast-dump %s | FileCheck -strict-whitespace %s

template <typename Ty>
// CHECK: FunctionTemplateDecl 0x{{[^ ]*}} <{{.*}}:1, line:[[@LINE+2]]:10> col:6 a
// CHECK-NEXT: TemplateTypeParmDecl 0x{{[^ ]*}} <line:[[@LINE-2]]:11, col:20> col:20 referenced typename depth 0 index 0 Ty
void a(Ty);

template <typename... Ty>
// CHECK: FunctionTemplateDecl 0x{{[^ ]*}} <line:[[@LINE-1]]:1, line:[[@LINE+2]]:13> col:6 b
// CHECK-NEXT: TemplateTypeParmDecl 0x{{[^ ]*}} <line:[[@LINE-2]]:11, col:23> col:23 referenced typename depth 0 index 0 ... Ty
void b(Ty...);

template <typename Ty, typename Uy>
// CHECK: FunctionTemplateDecl 0x{{[^ ]*}} <line:[[@LINE-1]]:1, line:[[@LINE+3]]:14> col:6 c
// CHECK-NEXT: TemplateTypeParmDecl 0x{{[^ ]*}} <line:[[@LINE-2]]:11, col:20> col:20 referenced typename depth 0 index 0 Ty
// CHECK-NEXT: TemplateTypeParmDecl 0x{{[^ ]*}} <col:24, col:33> col:33 referenced typename depth 0 index 1 Uy
void c(Ty, Uy);

template <>
void c<float, int>(float, int);
// CHECK: FunctionDecl 0x{{[^ ]*}} prev 0x{{[^ ]*}} <line:[[@LINE-2]]:1, line:[[@LINE-1]]:30> col:6 c 'void (float, int)'
// CHECK: TemplateArgument type 'float'
// CHECK: TemplateArgument type 'int'

template <typename Ty, template<typename> typename Uy>
// CHECK: FunctionTemplateDecl 0x{{[^ ]*}} <line:[[@LINE-1]]:1, line:[[@LINE+4]]:18> col:6 d
// CHECK-NEXT: TemplateTypeParmDecl 0x{{[^ ]*}} <line:[[@LINE-2]]:11, col:20> col:20 referenced typename depth 0 index 0 Ty
// CHECK-NEXT: TemplateTemplateParmDecl 0x{{[^ ]*}} <col:24, col:52> col:52 depth 0 index 1 Uy
// CHECK-NEXT: TemplateTypeParmDecl 0x{{[^ ]*}} <col:33> col:41 typename depth 1 index 0
void d(Ty, Uy<Ty>);

template <class Ty>
// CHECK: FunctionTemplateDecl 0x{{[^ ]*}} <line:[[@LINE-1]]:1, line:[[@LINE+2]]:10> col:6 e
// CHECK-NEXT: TemplateTypeParmDecl 0x{{[^ ]*}} <line:[[@LINE-2]]:11, col:17> col:17 referenced class depth 0 index 0 Ty
void e(Ty);

template <int N>
// CHECK: FunctionTemplateDecl 0x{{[^ ]*}} <line:[[@LINE-1]]:1, line:[[@LINE+2]]:17> col:6 f
// CHECK-NEXT: NonTypeTemplateParmDecl 0x{{[^ ]*}} <line:[[@LINE-2]]:11, col:15> col:15 referenced 'int' depth 0 index 0 N
void f(int i = N);

template <typename Ty = int>
// CHECK: FunctionTemplateDecl 0x{{[^ ]*}} <line:[[@LINE-1]]:1, line:[[@LINE+3]]:10> col:6 g
// CHECK-NEXT: TemplateTypeParmDecl 0x{{[^ ]*}} <line:[[@LINE-2]]:11, col:25> col:20 referenced typename depth 0 index 0 Ty
// CHECK-NEXT: TemplateArgument type 'int'
void g(Ty);

template <typename = void>
// CHECK: FunctionTemplateDecl 0x{{[^ ]*}} <line:[[@LINE-1]]:1, line:[[@LINE+3]]:8> col:6 h
// CHECK-NEXT: TemplateTypeParmDecl 0x{{[^ ]*}} <line:[[@LINE-2]]:11, col:22> col:20 typename depth 0 index 0
// CHECK-NEXT: TemplateArgument type 'void'
void h();

template <typename Ty>
// CHECK: ClassTemplateDecl 0x{{[^ ]*}} <line:[[@LINE-1]]:1, line:[[@LINE+3]]:11> col:8 R
// CHECK-NEXT: TemplateTypeParmDecl 0x{{[^ ]*}} <line:[[@LINE-2]]:11, col:20> col:20 typename depth 0 index 0 Ty
// CHECK: ClassTemplateSpecialization 0x{{[^ ]*}} 'R'
struct R {};

template <>
// CHECK: ClassTemplateSpecializationDecl 0x{{[^ ]*}} <line:[[@LINE-1]]:1, line:[[@LINE+2]]:16> col:8 struct R definition
// CHECK: TemplateArgument type 'int'
struct R<int> {};

template <typename Ty, class Uy>
// CHECK: ClassTemplateDecl 0x{{[^ ]*}} <line:[[@LINE-1]]:1, line:[[@LINE+3]]:11> col:8 S
// CHECK-NEXT: TemplateTypeParmDecl 0x{{[^ ]*}} <line:[[@LINE-2]]:11, col:20> col:20 typename depth 0 index 0 Ty
// CHECK-NEXT: TemplateTypeParmDecl 0x{{[^ ]*}} <col:24, col:30> col:30 class depth 0 index 1 Uy
struct S {};

template <typename Ty>
// CHECK: ClassTemplatePartialSpecializationDecl 0x{{[^ ]*}} <line:[[@LINE-1]]:1, line:[[@LINE+4]]:20> col:8 struct S definition
// CHECK: TemplateArgument type 'type-parameter-0-0'
// CHECK-NEXT: TemplateArgument type 'int'
// CHECK-NEXT: TemplateTypeParmDecl 0x{{[^ ]*}} <line:[[@LINE-4]]:11, col:20> col:20 referenced typename depth 0 index 0 Ty
struct S<Ty, int> {};

template <auto>
// CHECK: ClassTemplateDecl 0x{{[^ ]*}} <line:[[@LINE-1]]:1, line:[[@LINE+2]]:11> col:8 T
// CHECK-NEXT: NonTypeTemplateParmDecl 0x{{[^ ]*}} <line:[[@LINE-2]]:11> col:15 'auto' depth 0 index 0
struct T {};

template <decltype(auto)>
// CHECK: ClassTemplateDecl 0x{{[^ ]*}} <line:[[@LINE-1]]:1, line:[[@LINE+2]]:11> col:8 U
// CHECK-NEXT: NonTypeTemplateParmDecl 0x{{[^ ]*}} <line:[[@LINE-2]]:11> col:25 'decltype(auto)' depth 0 index 0
struct U {};

template <typename Ty>
// CHECK: ClassTemplateDecl 0x{{[^ ]*}} <line:[[@LINE-1]]:1, line:[[@LINE+7]]:1> line:[[@LINE+2]]:8 V
// CHECK-NEXT: TemplateTypeParmDecl 0x{{[^ ]*}} <line:[[@LINE-2]]:11, col:20> col:20 typename depth 0 index 0 Ty
struct V {
  template <typename Uy>
  // CHECK: FunctionTemplateDecl 0x{{[^ ]*}} <line:[[@LINE-1]]:3, line:[[@LINE+2]]:10> col:8 f
  // CHECK-NEXT: TemplateTypeParmDecl 0x{{[^ ]*}} <line:[[@LINE-2]]:13, col:22> col:22 typename depth 1 index 0 Uy
  void f();
};

template <typename Ty>
template <typename Uy>
// CHECK: FunctionTemplateDecl 0x{{[^ ]*}} parent 0x{{[^ ]*}} prev 0x{{[^ ]*}} <line:[[@LINE-1]]:1, line:[[@LINE+2]]:18> col:13 f
// CHECK-NEXT: TemplateTypeParmDecl 0x{{[^ ]*}} <line:[[@LINE-2]]:11, col:20> col:20 typename depth 1 index 0 Uy
void V<Ty>::f() {}