Extended Description

$ cat /tmp/t2.cpp

#ifndef HEADER
#define HEADER

template <typename T, typename U>
concept not_same_as = true;

template
struct subrange {
template <not_same_as R>
subrange(R) requires (Kind == 0);

template <not_same_as R>
subrange(R) requires (Kind != 0);
};

template
subrange(R) -> subrange<42>;

int main() {
int c[3];
subrange s(c);
}

$ ./bin/clang -cc1 -emit-pch -std=c++2a -o /tmp/pch /tmp/t2.cpp
$ ./bin/clang -cc1 -include-pch /tmp/pch -std=c++2a -emit-llvm -o - /tmp/t2.cpp

LEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: ./bin/clang -cc1 -include-pch /tmp/pch -std=c++2a -emit-llvm -o - /tmp/t2.cpp

1.  <eof> parser at end of file
   

#​0 llvm::sys::PrintStackTrace(llvm::raw_ostream&) llvm-project/llvm/lib/Support/Unix/Signals.inc:564:13
#​1 llvm::sys::RunSignalHandlers() llvm-project/llvm/lib/Support/Signals.cpp:69:18
#​2 SignalHandler(int) llvm-project/llvm/lib/Support/Unix/Signals.inc:396:3
#​3 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14110)
#​4 clang::ConceptReference::getNamedConcept() const llvm-project/clang/include/clang/AST/ASTConcept.h:155:12
#​5 isSameTemplateParameter(clang::NamedDecl const*, clang::NamedDecl const*) llvm-project/clang/lib/Serialization/ASTReaderDecl.cpp:2919:17
#​6 isSameTemplateParameterList(clang::ASTContext const&, clang::TemplateParameterList const*, clang::TemplateParameterList const*) llvm-project/clang/lib/Serialization/ASTReaderDecl.cpp:3010:10
#​7 clang::ASTDeclReader::findExisting(clang::NamedDecl*) llvm-project/clang/lib/Serialization/ASTReaderDecl.cpp:3498:13
#​8 clang::ASTDeclReader::FindExistingResult::operator clang::NamedDecl*() const llvm-project/clang/lib/Serialization/ASTReaderDecl.cpp:238:44
#​9 void clang::ASTDeclReader::mergeRedeclarableclang::RedeclarableTemplateDecl(clang::Redeclarableclang::RedeclarableTemplateDecl, clang::ASTDeclReader::RedeclarableResult&, unsigned int) llvm-project/clang/lib/Serialization/ASTReaderDecl.cpp:2505:31
#​10 clang::ASTDeclReader::VisitRedeclarableTemplateDecl(clang::RedeclarableTemplateDecl) llvm-project/clang/lib/Serialization/ASTReaderDecl.cpp:2090:18
#​11 clang::ASTDeclReader::VisitFunctionTemplateDecl(clang::FunctionTemplateDecl*) llvm-project/clang/lib/Serialization/ASTReaderDecl.cpp:2236:18
#​12 clang::ASTDeclReader::Visit(clang::Decl*) llvm-project/clang/lib/Serialization/ASTReaderDecl.cpp:527:34
#​13 llvm::isa_impl<clang::DeclContext, clang::Decl, void>::doit(clang::Decl const&) llvm-project/llvm/include/llvm/Support/Casting.h:58:12
#​14 llvm::isa_impl_cl<clang::DeclContext, clang::Decl const*>::doit(clang::Decl const*) llvm-project/llvm/include/llvm/Support/Casting.h:105:12
#​15 llvm::isa_impl_wrap<clang::DeclContext, clang::Decl const*, clang::Decl const*>::doit(clang::Decl const* const&) llvm-project/llvm/include/llvm/Support/Casting.h:131:12
#​16 llvm::isa_impl_wrap<clang::DeclContext, clang::Decl* const, clang::Decl const*>::doit(clang::Decl* const&) llvm-project/llvm/include/llvm/Support/Casting.h:121:12
#​17 bool llvm::isa<clang::DeclContext, clang::Decl*>(clang::Decl* const&) llvm-project/llvm/include/llvm/Support/Casting.h:142:10
#​18 llvm::cast_retty<clang::DeclContext, clang::Decl*>::ret_type llvm::dyn_cast<clang::DeclContext, clang::Decl>(clang::Decl*) llvm-project/llvm/include/llvm/Support/Casting.h:345:10
#​19 clang::ASTReader::ReadDeclRecord(unsigned int) llvm-project/clang/lib/Serialization/ASTReaderDecl.cpp:4061:18
#​20 clang::ASTReader::GetDecl(unsigned int) llvm-project/clang/lib/Serialization/ASTReader.cpp:7424:9
#​21 clang::ASTReader::FindExternalVisibleDeclsByName(clang::DeclContext const*, clang::DeclarationName) llvm-project/clang/lib/Serialization/ASTReader.cpp:7614:37
#​22 clang::DeclContext::lookup(clang::DeclarationName) const llvm-project/clang/lib/AST/DeclBase.cpp:1699:60
#​23 clang::ASTReader::CompleteRedeclChain(clang::Decl const*) llvm-project/clang/lib/Serialization/ASTReader.cpp:7191:62
#​24 clang::LazyGenerationalUpdatePtr<clang::Decl const*, clang::Decl*, &(clang::ExternalASTSource::CompleteRedeclChain(clang::Decl const*))>::get(clang::Decl const*) llvm-project/clang/include/clang/AST/ExternalASTSource.h:449:23
#​25 clang::Redeclarableclang::FunctionDecl::DeclLink::getPrevious(clang::FunctionDecl const*) const llvm-project/clang/include/clang/AST/Redeclarable.h:134:62
#​26 clang::Redeclarableclang::FunctionDecl::getNextRedeclaration() const llvm-project/clang/include/clang/AST/Redeclarable.h:190:23
#​27 clang::Redeclarableclang::FunctionDecl::redecl_iterator::operator++() llvm-project/clang/include/clang/AST/Redeclarable.h:271:34
#​28 clang::FunctionDecl::isDefined(clang::FunctionDecl const*&) const llvm-project/clang/lib/AST/Decl.cpp:2871:15
#​29 clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation, clang::FunctionDecl*, bool, bool, bool) llvm-project/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp:4615:58
#​30 clang::FunctionDecl::isDefined() const llvm-project/clang/include/clang/AST/Decl.h:2035:12
#​31 clang::Sema::PerformPendingInstantiations(bool) llvm-project/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp:6074:23
#​32 llvm::TimeTraceScope::~TimeTraceScope() llvm-project/llvm/include/llvm/Support/TimeProfiler.h:86:9
#​33 clang::Sema::ActOnEndOfTranslationUnitFragment(clang::Sema::TUFragmentKind) llvm-project/clang/lib/Sema/Sema.cpp:957:3
#​34 clang::Sema::ActOnEndOfTranslationUnit() llvm-project/clang/lib/Sema/Sema.cpp:998:9
#​35 clang::Parser::ParseTopLevelDecl(clang::OpaquePtrclang::DeclGroupRef&, bool) llvm-project/clang/lib/Parse/Parser.cpp:657:15
#​36 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtrclang::DeclGroupRef&) llvm-project/clang/lib/Parse/Parser.cpp:555:26
#​37 clang::ParseAST(clang::Sema&, bool, bool) llvm-project/clang/lib/Parse/ParseAST.cpp:0:25
#​38 clang::FrontendAction::Execute() llvm-project/clang/lib/Frontend/FrontendAction.cpp:954:10
#else
#endif