[clang] Make handling of unnamed template params similar to function params

[kadircet]

Summary

Clang uses the location identifier should be inserted for declarator
decls when a decl is unnamed. But for type template and template template
paramaters it uses the location of "typename/class" keyword, which makes it hard
for tooling to insert/change parameter names.

This change tries to unify these two cases by making template parameter
parsing and sourcerange operations similar to function params/declarator decls.

[ilya-biryukov]

clang/lib/AST/DeclTemplate.cpp

513–518

Could you provide more details why we need this change?

clang/lib/Parse/ParseTemplate.cpp

633

What happens if there's a comment? E.g.

template <class /*Something*/>

where would we point to and does that align with the function parameter case?

clang/lib/Sema/SemaTemplate.cpp

1008

NIT: maybe remove the extra variable and use ParamNameLoc everywhere?

clang/test/AST/ast-dump-record-definition-data-json.cpp

398–399

Does that mean we do not have locations in some cases now?
Is that a regression?

[kadircet]

• Address comments

clang/lib/AST/DeclTemplate.cpp

513–518

added comments, you can also see the similar case in DeclaratorDecl::getSourceRange()

clang/lib/Parse/ParseTemplate.cpp

633

that's same with parmvardecl case, both refer to beginning of the next token that has been lexed.

clang/test/AST/ast-dump-record-definition-data-json.cpp

398–399

I believe not, this test is a little bit weird, if you look at the code at the beginning, it doesn't contain any "template" stuff explicitly.
So this is rather coming from implicit nodes(that doesn't have any line numbers but only column numbers)

Previously test was checking the "class" as the name of the parmdecl, hence the tokLen: 4, now it is unnamed therefore no ranges for it.
though we still have the location marker for class (col:29 tokLen: 4)

[ilya-biryukov]

clang/lib/AST/DeclTemplate.cpp

513–518

Could you provide an example? What the range was before and what is it now?

clang/lib/Parse/ParseTemplate.cpp

633

ok, LG, thanks

clang/test/AST/ast-dump-record-definition-data-json.cpp

398–399

Agree, these tests do not seem to test this at all, e.g. there are other nodes which are output without any locations.
LGTM

[kadircet]

clang/lib/AST/DeclTemplate.cpp

513–518

TypeDecl::getSourceRange will also include the next token if template parameter is unnamed for example:

template <typename>
          ~~~~~~~~~

has the following > covered inside typerange.

[ilya-biryukov]

clang/lib/AST/DeclTemplate.cpp

513–518

Thanks for clearing this up. Could you mention in the comment why TypeDecl::getSourceRange is wrong in that case?

From offline discussion, I figured that it should not be pointing to the name location in the case of un-named parameters as this would lead to the closing angle bracket being included in the range for template parameter, i.e. we'll get <[[class>]] instead of <[[class]]>

515

getName() may fail if the name is not an identifier.
Even though this shouldn't happen for TypeDecls, could you please change to getDeclName().isEmpty()?

It's equivalent and does not have any assertions.

[kadircet]

• Address comments

[ilya-biryukov]

Many thanks! LGTM

clang/lib/AST/DeclTemplate.cpp

return hasDefaultArgument()
              ? getDefaultArgumentInfo()->getTypeLoc().getBeginLoc()
              : SourceLocation();
 }
 
 SourceRange TemplateTypeParmDecl::getSourceRange() const {
   if (hasDefaultArgument() && !defaultArgumentWasInherited())
     return SourceRange(getBeginLoc(),
                        getDefaultArgumentInfo()->getTypeLoc().getEndLoc());
-  else
-    return TypeDecl::getSourceRange();
+  // TypeDecl::getSourceRange returns a range containing name location, which is
+  // wrong for unnamed template parameters. e.g:
+  // it will return <[[typename>]] instead of <[[typename]]>
+  else if (getDeclName().isEmpty())
+    return SourceRange(getBeginLoc());
 }
 
 unsigned TemplateTypeParmDecl::getDepth() const {
   return getTypeForDecl()->getAs<TemplateTypeParmType>()->getDepth();
 }
 
 unsigned TemplateTypeParmDecl::getIndex() const {
   return getTypeForDecl()->getAs<TemplateTypeParmType>()->getIndex();

clang/lib/Parse/ParseTemplate.cpp

NamedDecl *Parser::ParseTypeParameter(unsigned Depth, unsigned Position) {
   if (TryConsumeToken(tok::ellipsis, EllipsisLoc)) {
     Diag(EllipsisLoc,
          getLangOpts().CPlusPlus11
            ? diag::warn_cxx98_compat_variadic_templates
            : diag::ext_variadic_templates);
   }
 
   // Grab the template parameter name (if given)
-  SourceLocation NameLoc;
+  SourceLocation NameLoc = Tok.getLocation();
   IdentifierInfo *ParamName = nullptr;
   if (Tok.is(tok::identifier)) {
     ParamName = Tok.getIdentifierInfo();
-    NameLoc = ConsumeToken();
+    ConsumeToken();
   } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
                          tok::greatergreater)) {
     // Unnamed template parameter. Don't have to do anything here, just
     // don't consume this token.
   } else {
     Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
     return nullptr;
   }
Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) {
   SourceLocation EllipsisLoc;
   if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
     Diag(EllipsisLoc,
          getLangOpts().CPlusPlus11
            ? diag::warn_cxx98_compat_variadic_templates
            : diag::ext_variadic_templates);
 
   // Get the identifier, if given.
-  SourceLocation NameLoc;
+  SourceLocation NameLoc = Tok.getLocation();
   IdentifierInfo *ParamName = nullptr;
   if (Tok.is(tok::identifier)) {
     ParamName = Tok.getIdentifierInfo();
-    NameLoc = ConsumeToken();
+    ConsumeToken();
   } else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
                          tok::greatergreater)) {
     // Unnamed template parameter. Don't have to do anything here, just
     // don't consume this token.
   } else {
     Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
     return nullptr;
   }

clang/lib/Sema/SemaTemplate.cpp

NamedDecl *Sema::ActOnTypeParameter(Scope *S, bool Typename,
                                IdentifierInfo *ParamName,
                                SourceLocation ParamNameLoc,
                                unsigned Depth, unsigned Position,
                                SourceLocation EqualLoc,
                                ParsedType DefaultArg) {
   assert(S->isTemplateParamScope() &&
          "Template type parameter not in template parameter scope!");
 
-  SourceLocation Loc = ParamNameLoc;
-  if (!ParamName)
-    Loc = KeyLoc;
-
   bool IsParameterPack = EllipsisLoc.isValid();
-  TemplateTypeParmDecl *Param
-    = TemplateTypeParmDecl::Create(Context, Context.getTranslationUnitDecl(),
-                                   KeyLoc, Loc, Depth, Position, ParamName,
-                                   Typename, IsParameterPack);
+  TemplateTypeParmDecl *Param = TemplateTypeParmDecl::Create(
+      Context, Context.getTranslationUnitDecl(), KeyLoc, ParamNameLoc, Depth,
+      Position, ParamName, Typename, IsParameterPack);
   Param->setAccess(AS_public);
 
   if (Param->isParameterPack())
     if (auto *LSI = getEnclosingLambda())
       LSI->LocalPacks.push_back(Param);
 
   if (ParamName) {
     maybeDiagnoseTemplateParameterShadow(*this, S, ParamNameLoc, ParamName);
NamedDecl *Sema::ActOnTypeParameter(Scope *S, bool Typename,
   // Handle the default argument, if provided.
   if (DefaultArg) {
     TypeSourceInfo *DefaultTInfo;
     GetTypeFromParser(DefaultArg, &DefaultTInfo);
 
     assert(DefaultTInfo && "expected source information for type");
 
     // Check for unexpanded parameter packs.
-    if (DiagnoseUnexpandedParameterPack(Loc, DefaultTInfo,
+    if (DiagnoseUnexpandedParameterPack(ParamNameLoc, DefaultTInfo,
                                         UPPC_DefaultArgument))
       return Param;
 
     // Check the template argument itself.
     if (CheckTemplateArgument(Param, DefaultTInfo)) {
       Param->setInvalidDecl();
       return Param;
     }

clang/test/AST/ast-dump-decl.cpp

 // CHECK-NEXT:  |-NonTypeTemplateParmDecl 0x{{.+}} <col:12, col:20> col:16 'int' depth 0 index 0 I
 // CHECK-NEXT:  | `-TemplateArgument expr
 // CHECK-NEXT:  |   `-ConstantExpr 0x{{.+}} <col:20> 'int'
 // CHECK-NEXT:  |     `-IntegerLiteral 0x{{.+}} <col:20> 'int' 42
 // CHECK-NEXT:  `-CXXRecordDecl 0x{{.+}} <col:24, col:31> col:31 struct TestTemplateDefaultNonType
 
 // CHECK:       ClassTemplateDecl 0x{{.+}} <{{.+}}:275:3, col:68> col:68 TestTemplateTemplateDefaultType
 // CHECK-NEXT:  |-TemplateTemplateParmDecl 0x{{.+}} <col:12, col:42> col:37 depth 0 index 0 TT
-// CHECK-NEXT:  | |-TemplateTypeParmDecl 0x{{.+}} <col:21> col:21 typename depth 1 index 0
+// CHECK-NEXT:  | |-TemplateTypeParmDecl 0x{{.+}} <col:21> col:29 typename depth 1 index 0
 // CHECK-NEXT:  | `-TemplateArgument <col:42> template TestClassTemplate
 // CHECK-NEXT:  `-CXXRecordDecl 0x{{.+}} <col:61, col:68> col:68 struct TestTemplateTemplateDefaultType
 
 // CHECK:       ClassTemplateDecl 0x{{.+}} prev 0x{{.+}} <{{.+}}:276:3, col:82> col:48 TestTemplateTemplateDefaultType
 // CHECK-NEXT:  |-TemplateTemplateParmDecl 0x{{.+}} <col:12, col:37> col:37 depth 0 index 0 TT
-// CHECK-NEXT:  | |-TemplateTypeParmDecl 0x{{.+}} <col:21> col:21 typename depth 1 index 0
+// CHECK-NEXT:  | |-TemplateTypeParmDecl 0x{{.+}} <col:21> col:29 typename depth 1 index 0
 // CHECK-NEXT:  | `-TemplateArgument <line:275:42> template TestClassTemplate
 // CHECK-NEXT:  |   `-inherited from TemplateTemplateParm 0x{{.+}} 'TT'
 // CHECK-NEXT:  `-CXXRecordDecl 0x{{.+}} prev 0x{{.+}} <line:276:41, col:82> col:48 struct TestTemplateTemplateDefaultType definition
 // CHECK-NEXT:    |-DefinitionData empty aggregate standard_layout trivially_copyable pod trivial literal has_constexpr_non_copy_move_ctor can_const_default_init
 // CHECK-NEXT:    | |-DefaultConstructor exists trivial constexpr needs_implicit defaulted_is_constexpr
 // CHECK-NEXT:    | |-CopyConstructor simple trivial has_const_param needs_implicit implicit_has_const_param
 // CHECK-NEXT:    | |-MoveConstructor exists simple trivial needs_implicit
 // CHECK-NEXT:    | |-CopyAssignment trivial has_const_param needs_implicit implicit_has_const_param

clang/test/AST/ast-dump-record-definition-data-json.cpp

 // CHECK-NEXT:     {
 // CHECK-NEXT:      "id": "0x{{.*}}",
 // CHECK-NEXT:      "kind": "TemplateTypeParmDecl",
 // CHECK-NEXT:      "loc": {
 // CHECK-NEXT:       "col": 29,
 // CHECK-NEXT:       "tokLen": 4
 // CHECK-NEXT:      },
 // CHECK-NEXT:      "range": {
-// CHECK-NEXT:       "begin": {
-// CHECK-NEXT:        "col": 29,
-// CHECK-NEXT:        "tokLen": 4
-// CHECK-NEXT:       },
-// CHECK-NEXT:       "end": {
-// CHECK-NEXT:        "col": 29,
-// CHECK-NEXT:        "tokLen": 4
-// CHECK-NEXT:       }
+// CHECK-NEXT:       "begin": {},
+// CHECK-NEXT:       "end": {}
 // CHECK-NEXT:      },
 // CHECK-NEXT:      "isImplicit": true,
 // CHECK-NEXT:      "tagUsed": "class",
 // CHECK-NEXT:      "depth": 0,
 // CHECK-NEXT:      "index": 0
 // CHECK-NEXT:     },
 // CHECK-NEXT:     {
 // CHECK-NEXT:      "id": "0x{{.*}}",

 // CHECK-NEXT:     {
 // CHECK-NEXT:      "id": "0x{{.*}}",
 // CHECK-NEXT:      "kind": "TemplateTypeParmDecl",
 // CHECK-NEXT:      "loc": {
 // CHECK-NEXT:       "col": 29,
 // CHECK-NEXT:       "tokLen": 4
 // CHECK-NEXT:      },
 // CHECK-NEXT:      "range": {
-// CHECK-NEXT:       "begin": {
-// CHECK-NEXT:        "col": 29,
-// CHECK-NEXT:        "tokLen": 4
-// CHECK-NEXT:       },
-// CHECK-NEXT:       "end": {
-// CHECK-NEXT:        "col": 29,
-// CHECK-NEXT:        "tokLen": 4
-// CHECK-NEXT:       }
+// CHECK-NEXT:       "begin": {},
+// CHECK-NEXT:       "end": {}
 // CHECK-NEXT:      },
 // CHECK-NEXT:      "isImplicit": true,
 // CHECK-NEXT:      "tagUsed": "class",
 // CHECK-NEXT:      "depth": 0,
 // CHECK-NEXT:      "index": 0
 // CHECK-NEXT:     },
 // CHECK-NEXT:     {
 // CHECK-NEXT:      "id": "0x{{.*}}",

 // CHECK-NEXT:     {
 // CHECK-NEXT:      "id": "0x{{.*}}",
 // CHECK-NEXT:      "kind": "TemplateTypeParmDecl",
 // CHECK-NEXT:      "loc": {
 // CHECK-NEXT:       "col": 29,
 // CHECK-NEXT:       "tokLen": 4
 // CHECK-NEXT:      },
 // CHECK-NEXT:      "range": {
-// CHECK-NEXT:       "begin": {
-// CHECK-NEXT:        "col": 29,
-// CHECK-NEXT:        "tokLen": 4
-// CHECK-NEXT:       },
-// CHECK-NEXT:       "end": {
-// CHECK-NEXT:        "col": 29,
-// CHECK-NEXT:        "tokLen": 4
-// CHECK-NEXT:       }
+// CHECK-NEXT:       "begin": {},
+// CHECK-NEXT:       "end": {}
 // CHECK-NEXT:      },
 // CHECK-NEXT:      "isImplicit": true,
 // CHECK-NEXT:      "tagUsed": "class",
 // CHECK-NEXT:      "depth": 0,
 // CHECK-NEXT:      "index": 0
 // CHECK-NEXT:     },
 // CHECK-NEXT:     {
 // CHECK-NEXT:      "id": "0x{{.*}}",

clang/test/AST/ast-dump-template-decls-json.cpp

 // CHECK-NEXT:      "name": "Uy",
 // CHECK-NEXT:      "depth": 0,
 // CHECK-NEXT:      "index": 1,
 // CHECK-NEXT:      "inner": [
 // CHECK-NEXT:       {
 // CHECK-NEXT:        "id": "0x{{.*}}",
 // CHECK-NEXT:        "kind": "TemplateTypeParmDecl",
 // CHECK-NEXT:        "loc": {
-// CHECK-NEXT:         "col": 33,
-// CHECK-NEXT:         "tokLen": 8
+// CHECK-NEXT:         "col": 41,
+// CHECK-NEXT:         "tokLen": 1
 // CHECK-NEXT:        },
 // CHECK-NEXT:        "range": {
 // CHECK-NEXT:         "begin": {
 // CHECK-NEXT:          "col": 33,
 // CHECK-NEXT:          "tokLen": 8
 // CHECK-NEXT:         },
 // CHECK-NEXT:         "end": {
 // CHECK-NEXT:          "col": 33,

 // CHECK-NEXT:    },
 // CHECK-NEXT:    "name": "h",
 // CHECK-NEXT:    "inner": [
 // CHECK-NEXT:     {
 // CHECK-NEXT:      "id": "0x{{.*}}",
 // CHECK-NEXT:      "kind": "TemplateTypeParmDecl",
 // CHECK-NEXT:      "loc": {
 // CHECK-NEXT:       "line": 27,
-// CHECK-NEXT:       "col": 11,
-// CHECK-NEXT:       "tokLen": 8
+// CHECK-NEXT:       "col": 20,
+// CHECK-NEXT:       "tokLen": 1
 // CHECK-NEXT:      },
 // CHECK-NEXT:      "range": {
 // CHECK-NEXT:       "begin": {
 // CHECK-NEXT:        "col": 11,
 // CHECK-NEXT:        "tokLen": 8
 // CHECK-NEXT:       },
 // CHECK-NEXT:       "end": {
 // CHECK-NEXT:        "col": 22,

clang/test/AST/ast-dump-template-decls.cpp

 // 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:33 typename depth 1 index 0
+// 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:11 typename depth 0 index 0
+// 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 {};

clang/test/ASTMerge/class-template/test.cpp

 // RUN: %clang_cc1 -std=c++1z -emit-pch -o %t.1.ast %S/Inputs/class-template1.cpp
 // RUN: %clang_cc1 -std=c++1z -emit-pch -o %t.2.ast %S/Inputs/class-template2.cpp
 // RUN: %clang_cc1 -std=c++1z  -ast-merge %t.1.ast -ast-merge %t.2.ast -fsyntax-only %s 2>&1 | FileCheck %s
 
 static_assert(sizeof(X0<char>().getValue(1)) == sizeof(char));
 static_assert(sizeof(X0<int>().getValue(1)) == sizeof(int));
 
 // CHECK: class-template1.cpp:9:14: warning: non-type template parameter declared with incompatible types in different translation units ('int' vs. 'long')
 // CHECK: class-template2.cpp:9:15: note: declared here with type 'long'
 
 // CHECK: class-template1.cpp:12:14: warning: template parameter has different kinds in different translation units
-// CHECK: class-template2.cpp:12:10: note: template parameter declared here
+// CHECK: class-template2.cpp:12:18: note: template parameter declared here
 
 // CHECK: class-template1.cpp:18:23: warning: non-type template parameter declared with incompatible types in different translation units ('long' vs. 'int')
 // CHECK: class-template2.cpp:18:23: note: declared here with type 'int'
 
-// CHECK: class-template1.cpp:21:10: warning: template parameter has different kinds in different translation units
-// CHECK: class-template2.cpp:21:10: note: template parameter declared here
+// CHECK: class-template1.cpp:21:18: warning: template parameter has different kinds in different translation units
+// CHECK: class-template2.cpp:21:31: note: template parameter declared here
 
 // CHECK: class-template2.cpp:27:20: warning: external variable 'x0r' declared with incompatible types in different translation units ('X0<double> *' vs. 'X0<float> *')
 // CHECK: class-template1.cpp:26:19: note: declared here with type 'X0<float> *'
 
 // CHECK: class-template1.cpp:35:8: warning: type 'X0<wchar_t>' has incompatible definitions in different translation units
 // CHECK: class-template1.cpp:36:7: note: field 'member' has type 'int' here
 // CHECK: class-template2.cpp:36:9: note: field 'member' has type 'float' here
 
 // CHECK: 6 warnings generated.
 // CHECK-NOT: static_assert

clang/test/Index/index-templates.cpp

 // CHECK-LOAD: index-templates.cpp:35:31: UnexposedExpr= Extent=[35:31 - 35:32]
 // CHECK-LOAD: index-templates.cpp:35:31: IntegerLiteral= Extent=[35:31 - 35:32]
 // CHECK-LOAD: index-templates.cpp:37:8: ClassTemplate=array:37:8 (Definition) Extent=[36:1 - 37:17]
 // CHECK-LOAD: index-templates.cpp:36:19: TemplateTypeParameter=T:36:19 (Definition) Extent=[36:10 - 36:20]
 // CHECK-LOAD: index-templates.cpp:36:31: NonTypeTemplateParameter=Dimensions:36:31 (Definition) Extent=[36:22 - 36:56]
 // CHECK-LOAD: index-templates.cpp:36:44: DeclRefExpr=OneDimension:35:16 Extent=[36:44 - 36:56]
 // CHECK-LOAD: index-templates.cpp:40:8: ClassTemplate=storage:40:8 (Definition) Extent=[39:1 - 40:19]
 // CHECK-LOAD: index-templates.cpp:39:45: TemplateTemplateParameter=DataStructure:39:45 (Definition) Extent=[39:10 - 39:66]
-// CHECK-LOAD: index-templates.cpp:39:19: TemplateTypeParameter=:39:19 (Definition) Extent=[39:19 - 39:27]
+// CHECK-LOAD: index-templates.cpp:39:27: TemplateTypeParameter=:39:27 (Definition) Extent=[39:19 - 39:27]
 // CHECK-LOAD: index-templates.cpp:39:37: NonTypeTemplateParameter=:39:37 (Definition) Extent=[39:29 - 39:37]
 // CHECK-LOAD: index-templates.cpp:39:61: TemplateRef=array:37:8 Extent=[39:61 - 39:66]
 // CHECK-LOAD: index-templates.cpp:42:18: TypedefDecl=Unsigned:42:18 (Definition) Extent=[42:1 - 42:26]
 // CHECK-LOAD: index-templates.cpp:45:8: ClassTemplate=value_c:45:8 Extent=[44:1 - 45:15]
 // CHECK-LOAD: index-templates.cpp:44:19: TemplateTypeParameter=T:44:19 (Definition) Extent=[44:10 - 44:20]
 // CHECK-LOAD: index-templates.cpp:44:31: NonTypeTemplateParameter=Value:44:31 (Definition) Extent=[44:22 - 44:36]
 // CHECK-LOAD: index-templates.cpp:44:22: TypeRef=Unsigned:42:18 Extent=[44:22 - 44:30]
 // CHECK-LOAD: index-templates.cpp:47:16: ClassDecl=vector:47:16 (Definition) [Specialization of vector:14:7] Extent=[47:1 - 47:28]