[llvm-bugs] [Bug 41792] New: Clang assertion failure on templated friend member function

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41792

            Bug ID: 41792
           Summary: Clang assertion failure on templated friend member
                    function
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rtrieu at google.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

$ cat test.ii
template <class>
class S {
  template <>
  friend S* S::Run();
};

$ clang -fsyntax-only test.ii
...
clang-9: ../tools/clang/include/clang/AST/DeclTemplate.h:133: clang::NamedDecl
*clang::TemplateParameterList::getParam(unsigned int): Assertion `Idx < size()
&& "Template parameter index out-of-range"' failed.
...
 #9 0x00000000048f3494 clang::TemplateParameterList::getParam(unsigned int) 
#10 0x000000000728dc28 (anonymous
namespace)::DependencyChecker::DependencyChecker(clang::TemplateParameterList*,
bool) 
#11 0x000000000722ed2f DependsOnTemplateParameters(clang::QualType,
clang::TemplateParameterList*) 
#12 0x000000000722e297
clang::Sema::MatchTemplateParametersToScopeSpecifier(clang::SourceLocation,
clang::SourceLocation, clang::CXXScopeSpec const&,
clang::TemplateIdAnnotation*, llvm::ArrayRef<clang::TemplateParameterList*>,
bool, bool&, bool&) 
#13 0x0000000006a1fb70 clang::Sema::ActOnFunctionDeclarator(clang::Scope*,
clang::Declarator&, clang::DeclContext*, clang::TypeSourceInfo*,
clang::LookupResult&, llvm::MutableArrayRef<clang::TemplateParameterList*>,
bool&) 
#14 0x0000000006c7acdb clang::Sema::ActOnFriendFunctionDecl(clang::Scope*,
clang::Declarator&, llvm::MutableArrayRef<clang::TemplateParameterList*>) 
#15 0x00000000067a1af7
clang::Parser::ParseCXXClassMemberDeclaration(clang::AccessSpecifier,
clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo const&,
clang::ParsingDeclRAIIObject*) 
#16 0x0000000006831070
clang::Parser::ParseSingleDeclarationAfterTemplate(clang::DeclaratorContext,
clang::Parser::ParsedTemplateInfo const&, clang::ParsingDeclRAIIObject&,
clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) 
#17 0x0000000006830ccd
clang::Parser::ParseTemplateDeclarationOrSpecialization(clang::DeclaratorContext,
clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) 
#18 0x00000000067a0a60
clang::Parser::ParseCXXClassMemberDeclaration(clang::AccessSpecifier,
clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo const&,
clang::ParsingDeclRAIIObject*) 
#19 0x00000000067a3204
clang::Parser::ParseCXXClassMemberDeclarationWithPragmas(clang::AccessSpecifier&,
clang::Parser::ParsedAttributesWithRange&, clang::TypeSpecifierType,
clang::Decl*) 
#20 0x000000000679e8a2
clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation,
clang::SourceLocation, clang::Parser::ParsedAttributesWithRange&, unsigned int,
clang::Decl*) 
#21 0x000000000679d288
clang::Parser::ParseClassSpecifier(clang::tok::TokenKind,
clang::SourceLocation, clang::DeclSpec&, clang::Parser::ParsedTemplateInfo
const&, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext,
clang::Parser::ParsedAttributesWithRange&) 
#22 0x0000000006778022
clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&,
clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier,
clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*) 
#23 0x000000000683120d
clang::Parser::ParseSingleDeclarationAfterTemplate(clang::DeclaratorContext,
clang::Parser::ParsedTemplateInfo const&, clang::ParsingDeclRAIIObject&,
clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) 
#24 0x0000000006830ccd
clang::Parser::ParseTemplateDeclarationOrSpecialization(clang::DeclaratorContext,
clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) 
#25 0x0000000006830656
clang::Parser::ParseDeclarationStartingWithTemplate(clang::DeclaratorContext,
clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) 
#26 0x0000000006774629
clang::Parser::ParseDeclaration(clang::DeclaratorContext,
clang::SourceLocation&, clang::Parser::ParsedAttributesWithRange&) 
#27 0x0000000006753fd9
clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*) 
#28 0x00000000067527bf
clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, bool) 
#29 0x0000000006752123
clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&) 
#30 0x000000000674ddee clang::ParseAST(clang::Sema&, bool, bool) 
#31 0x00000000046fb172 clang::ASTFrontendAction::ExecuteAction() 
...

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