extern void abort (void);

struct A { int i; int j; };
struct B { struct A *a; struct A *b; };
struct C { struct B *c; struct A *d; };
const struct C e = { &(struct B) { &(struct A) { 1, 2 }, &(struct A) { 3, 4 } }, &(struct A) { 5, 6 } };

int
main (void)
{
  if (e.c->a->i != 1 || e.c->a->j != 2)
    abort ();

  return 0;
}

clang: /root/llvm-project/clang/lib/AST/ExprConstant.cpp:1915: clang::APValue& {anonymous}::CallStackFrame::createLocal(clang::APValue::LValueBase, const void*, clang::QualType, {anonymous}::ScopeKind): Assertion `Result.isAbsent() && "local created multiple times"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.	Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/clang -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -S --gcc-toolchain=/opt/compiler-explorer/gcc-9.2.0 -fcolor-diagnostics -fno-crash-diagnostics -O0 <source>
1.	<source>:11:39: current parser token ')'
2.	<source>:10:1: parsing function body 'main'
3.	<source>:10:1: in compound statement ('{}')
 #0 0x000000000372dd18 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x372dd18)
 #1 0x000000000372b9dc llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x372b9dc)
 #2 0x00000000036742f8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007f6423c66420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
 #4 0x00007f642372900b raise (/lib/x86_64-linux-gnu/libc.so.6+0x4300b)
 #5 0x00007f6423708859 abort (/lib/x86_64-linux-gnu/libc.so.6+0x22859)
 #6 0x00007f6423708729 (/lib/x86_64-linux-gnu/libc.so.6+0x22729)
 #7 0x00007f6423719fd6 (/lib/x86_64-linux-gnu/libc.so.6+0x33fd6)
 #8 0x0000000006fbf4e2 (anonymous namespace)::CallStackFrame::createLocal(clang::APValue::LValueBase, void const*, clang::QualType, (anonymous namespace)::ScopeKind) ExprConstant.cpp:0:0
 #9 0x0000000006fbf5d8 clang::APValue& (anonymous namespace)::CallStackFrame::createTemporary<clang::Expr>(clang::Expr const*, clang::QualType, (anonymous namespace)::ScopeKind, (anonymous namespace)::LValue&) ExprConstant.cpp:0:0
#10 0x0000000006fcee83 Evaluate(clang::APValue&, (anonymous namespace)::EvalInfo&, clang::Expr const*) ExprConstant.cpp:0:0
#11 0x0000000006fd853f handleLValueToRValueConversion((anonymous namespace)::EvalInfo&, clang::Expr const*, clang::QualType, (anonymous namespace)::LValue const&, clang::APValue&, bool) ExprConstant.cpp:0:0
#12 0x000000000702fdf8 (anonymous namespace)::PointerExprEvaluator::VisitCastExpr(clang::CastExpr const*) ExprConstant.cpp:0:0
#13 0x0000000006fe7061 clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::PointerExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#14 0x0000000006fe832b EvaluatePointer(clang::Expr const*, (anonymous namespace)::LValue&, (anonymous namespace)::EvalInfo&, bool) ExprConstant.cpp:0:0
#15 0x000000000701c0a8 (anonymous namespace)::LValueExprEvaluator::VisitMemberExpr(clang::MemberExpr const*) ExprConstant.cpp:0:0
#16 0x0000000006ff8364 clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::LValueExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#17 0x0000000006ff9b7d EvaluateLValue(clang::Expr const*, (anonymous namespace)::LValue&, (anonymous namespace)::EvalInfo&, bool) ExprConstant.cpp:0:0
#18 0x0000000007013ffe (anonymous namespace)::IntExprEvaluator::VisitCastExpr(clang::CastExpr const*) ExprConstant.cpp:0:0
#19 0x0000000006fdff64 clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::IntExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#20 0x0000000006fce8ce Evaluate(clang::APValue&, (anonymous namespace)::EvalInfo&, clang::Expr const*) ExprConstant.cpp:0:0
#21 0x0000000006fd126e (anonymous namespace)::DataRecursiveIntBinOpEvaluator::process((anonymous namespace)::DataRecursiveIntBinOpEvaluator::EvalResult&) ExprConstant.cpp:0:0
#22 0x0000000007030cd3 (anonymous namespace)::IntExprEvaluator::VisitBinaryOperator(clang::BinaryOperator const*) ExprConstant.cpp:0:0
#23 0x0000000006fe00fd clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::IntExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#24 0x0000000006fce8ce Evaluate(clang::APValue&, (anonymous namespace)::EvalInfo&, clang::Expr const*) ExprConstant.cpp:0:0
#25 0x0000000006fd8b59 EvaluateAsRValue((anonymous namespace)::EvalInfo&, clang::Expr const*, clang::APValue&) ExprConstant.cpp:0:0
#26 0x0000000006fd97cf clang::Expr::EvaluateForOverflow(clang::ASTContext const&) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6fd97cf)
#27 0x0000000006063055 clang::Sema::CheckForIntOverflow(clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6063055)
#28 0x00000000060baf0d clang::Sema::CheckCompletedExpr(clang::Expr*, clang::SourceLocation, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x60baf0d)
#29 0x00000000065420b4 clang::Sema::ActOnFinishFullExpr(clang::Expr*, clang::SourceLocation, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x65420b4)
#30 0x0000000006439a5e clang::Sema::ActOnCondition(clang::Scope*, clang::SourceLocation, clang::Expr*, clang::Sema::ConditionKind, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6439a5e)
#31 0x0000000005f77a83 clang::Parser::ParseParenExprOrCondition(clang::ActionResult<clang::Stmt*, true>*, clang::Sema::ConditionResult&, clang::SourceLocation, clang::Sema::ConditionKind, clang::SourceLocation&, clang::SourceLocation&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f77a83)
#32 0x0000000005f802c6 clang::Parser::ParseIfStatement(clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f802c6)
#33 0x0000000005f79b9e clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f79b9e)
#34 0x0000000005f7b188 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f7b188)
#35 0x0000000005f7c0c9 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f7c0c9)
#36 0x0000000005f7d9ea clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5f7d9ea)
#37 0x0000000005eab6d1 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5eab6d1)
#38 0x0000000005ed2bd8 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5ed2bd8)
#39 0x0000000005e9fb3b clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5e9fb3b)
#40 0x0000000005ea026f clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (.part.0) Parser.cpp:0:0
#41 0x0000000005ea7c14 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5ea7c14)
#42 0x0000000005ea843d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5ea843d)
#43 0x0000000005e9b4ea clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5e9b4ea)
#44 0x00000000049982a8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x49982a8)
#45 0x00000000041fc4f9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x41fc4f9)
#46 0x000000000417d9ce clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x417d9ce)
#47 0x00000000042db54e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x42db54e)
#48 0x0000000000bef0e6 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbef0e6)
#49 0x0000000000be69aa ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#50 0x0000000003fd9c19 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#51 0x00000000036747a4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x36747a4)
#52 0x0000000003fda20f clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
#53 0x0000000003fa23d5 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3fa23d5)
#54 0x0000000003fa2e3d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3fa2e3d)
#55 0x0000000003faad65 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3faad65)
#56 0x0000000000bec58c clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbec58c)
#57 0x0000000000ae6751 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xae6751)
#58 0x00007f642370a083 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24083)
#59 0x0000000000be648e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbe648e)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)