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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Concepts] ICE on syntax error, in ConvertConstrainedAutoDeclSpecToType"
href="https://bugs.llvm.org/show_bug.cgi?id=48593">48593</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[Concepts] ICE on syntax error, in ConvertConstrainedAutoDeclSpecToType
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++2a
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>arthur.j.odwyer@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>// <a href="https://godbolt.org/z/8Tb4aa">https://godbolt.org/z/8Tb4aa</a>
template<class> concept C = true;
C<,> x
Originally reported by Leander Behr on the cpplang slack.
<source>:3:3: error: expected expression
C<,> x
^
<source>:3:1: error: expected 'auto' or 'decltype(auto)' after concept name
C<,> x
^
auto
PLEASE submit a bug report to <a href="https://bugs.llvm.org/">https://bugs.llvm.org/</a> and include the crash
backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /opt/compiler-explorer/clang-11.0.0/bin/clang++ -g
-o ./output.s -mllvm --x86-asm-syntax=intel -S
--gcc-toolchain=/opt/compiler-explorer/gcc-10.2.0 -fcolor-diagnostics
-fno-crash-diagnostics -std=c++20 -O3 <source>
1. <eof> parser at end of file
#0 0x0000556f4e0b547a llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x2cab47a)
#1 0x0000556f4e0b3224 llvm::sys::RunSignalHandlers()
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x2ca9224)
#2 0x0000556f4e0b3495 llvm::sys::CleanupOnSignal(unsigned long)
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x2ca9495)
#3 0x0000556f4e027cc0 CrashRecoverySignalHandler(int)
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x2c1dcc0)
#4 0x00007f672cfc23c0 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x153c0)
#5 0x0000556f50373f5b ConvertConstrainedAutoDeclSpecToType(clang::Sema&,
clang::DeclSpec&, clang::AutoTypeKeyword) (.isra.674)
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x4f69f5b)
#6 0x0000556f50389932 GetDeclSpecTypeForDeclarator((anonymous
namespace)::TypeProcessingState&, clang::TypeSourceInfo*&) (.constprop.1044)
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x4f7f932)
#7 0x0000556f50396e53 clang::Sema::GetTypeForDeclarator(clang::Declarator&,
clang::Scope*) (/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x4f8ce53)
#8 0x0000556f4fe378ee clang::Sema::HandleDeclarator(clang::Scope*,
clang::Declarator&, llvm::MutableArrayRef<clang::TemplateParameterList*>)
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x4a2d8ee)
#9 0x0000556f4fe38569 clang::Sema::ActOnDeclarator(clang::Scope*,
clang::Declarator&) (/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x4a2e569)
#10 0x0000556f4fc07d70
clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&,
clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*)
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x47fdd70)
#11 0x0000556f4fc0e705 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&,
clang::DeclaratorContext, clang::SourceLocation*, clang::Parser::ForRangeInit*)
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x4804705)
#12 0x0000556f4fbf0df9
clang::Parser::ParseDeclOrFunctionDefInternal(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec&, clang::AccessSpecifier)
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x47e6df9)
#13 0x0000556f4fbf1af1
clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*, clang::AccessSpecifier) (.part.228)
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x47e7af1)
#14 0x0000556f4fbf79c9
clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*)
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x47ed9c9)
#15 0x0000556f4fbf90d9
clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, bool)
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x47ef0d9)
#16 0x0000556f4fbecd19 clang::ParseAST(clang::Sema&, bool, bool)
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x47e2d19)
#17 0x0000556f4e8a1479 clang::FrontendAction::Execute()
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x3497479)
#18 0x0000556f4e85af9b
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x3450f9b)
#19 0x0000556f4e967b2b
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x355db2b)
#20 0x0000556f4c29014c cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/opt/compiler-explorer/clang-11.0.0/bin/clang+++0xe8614c)
#21 0x0000556f4c28cc4d ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&)
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0xe82c4d)
#22 0x0000556f4e732c45 void llvm::function_ref<void
()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>
<span class="quote">>, std::__cxx11::basic_string<char, std::char_traits<char>,</span >
std::allocator<char> >*, bool*) const::'lambda'()>(long)
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x3328c45)
#23 0x0000556f4e027da3
llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>)
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x2c1dda3)
#24 0x0000556f4e733720
clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>
<span class="quote">>, std::__cxx11::basic_string<char, std::char_traits<char>,</span >
std::allocator<char> >*, bool*) const (.part.148)
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x3329720)
#25 0x0000556f4e70d8f5
clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&,
clang::driver::Command const*&) const
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x33038f5)
#26 0x0000556f4e70e33f
clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&,
llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&) const
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x330433f)
#27 0x0000556f4e716ed5
clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&,
llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&)
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0x330ced5)
#28 0x0000556f4c1ccdc1 main
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0xdc2dc1)
#29 0x00007f672ca730b3 __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x270b3)
#30 0x0000556f4c28c7ca _start
(/opt/compiler-explorer/clang-11.0.0/bin/clang+++0xe827ca)</pre>
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