[clang-format] Crash when parsing requires clause

[ansemkiv]

clang-format crashes when trying to format the following (admittedly syntactically incorrect) code snippet

template <class T>
    requires(requires { std::declval<T>()

with the following call stack:

clang-format.exe!clang::format::UnwrappedLineParser::parseRequiresClause(clang::format::FormatToken * RequiresToken) Line 3636	C++
clang-format.exe!clang::format::UnwrappedLineParser::parseRequires() Line 3505	C++
clang-format.exe!clang::format::UnwrappedLineParser::parseStructuralElement(const clang::format::FormatToken * OpeningBrace,clang::format::UnwrappedLineParser::IfStmtKind * IfKind, clang::format::FormatToken * * IfLeftBrace, bool * HasDoWhile, bool * HasLabel) Line 1794	C++
clang-format.exe!clang::format::UnwrappedLineParser::parseLevel(const clang::format::FormatToken * OpeningBrace, clang::format::UnwrappedLineParser::IfStmtKind * IfKind,clang::format::FormatToken * * IfLeftBrace) Line 479	C++
clang-format.exe!clang::format::UnwrappedLineParser::parseFile() Line 289	C++
clang-format.exe!clang::format::UnwrappedLineParser::parse() Line 217	C++
clang-format.exe!clang::format::TokenAnalyzer::process(bool SkipAnnotation) Line 116	C++
[Inline Frame] clang-format.exe!clang::format::internal::reformat::__l39::<lambda_6>::operator()(const clang::format::Environment &) Line 3796	C++
[Inline Frame] clang-format.exe!std::invoke(clang::format::internal::reformat::__l39::<lambda_6> &) Line 1705	C++
clang-format.exe!std::_Func_impl_no_alloc<`clang::format::internal::reformat'::`39'::<lambda_6>,std::pair<clang::tooling::Replacements,unsigned int>clang::format::Environment const &>::_Do_call(const clang::format::Environment & <_Args_0>) Line 876	C++
[Inline Frame] clang-format.exe!std::_Func_class<std::pair<clang::tooling::Replacements,unsigned int>,clang::format::Environment const &>::operator()(constclang::format::Environment &) Line 920	C++
clang-format.exe!clang::format::internal::reformat(const clang::format::FormatStyle & Style, llvm::StringRef Code, llvm::ArrayRef<clang::tooling::Range> Ranges, unsignedint FirstStartColumn, unsigned int NextStartColumn, unsigned int LastStartColumn, llvm::StringRef FileName, clang::format::FormattingAttemptStatus * Status) Line 3843	++
clang-format.exe!clang::format::reformat(const clang::format::FormatStyle & Style, llvm::StringRef Code, llvm::ArrayRef<clang::tooling::Range> Ranges, llvm::StringRefFileName, clang::format::FormattingAttemptStatus * Status) Line 3886	C++
clang-format.exe!clang::format::format(llvm::StringRef FileName, bool ErrorOnIncompleteFormat) Line 511	C++
clang-format.exe!main(int argc, const char * * argv) Line 738	C++

Happens in main as well as 19.1.x, did not tried other versions.

[llvmbot]

@llvm/issue-subscribers-clang-format

Author: None (ansemkiv)

`clang-format` crashes when trying to format the following (admittedly syntactically incorrect) code snippet ``` template <class T> requires(requires { std::declval<T>() ``` with the following call stack: ``` clang-format.exe!clang::format::UnwrappedLineParser::parseRequiresClause(clang::format::FormatToken * RequiresToken) Line 3636 C++ clang-format.exe!clang::format::UnwrappedLineParser::parseRequires() Line 3505 C++ clang-format.exe!clang::format::UnwrappedLineParser::parseStructuralElement(const clang::format::FormatToken * OpeningBrace,clang::format::UnwrappedLineParser::IfStmtKind * IfKind, clang::format::FormatToken * * IfLeftBrace, bool * HasDoWhile, bool * HasLabel) Line 1794 C++ clang-format.exe!clang::format::UnwrappedLineParser::parseLevel(const clang::format::FormatToken * OpeningBrace, clang::format::UnwrappedLineParser::IfStmtKind * IfKind,clang::format::FormatToken * * IfLeftBrace) Line 479 C++ clang-format.exe!clang::format::UnwrappedLineParser::parseFile() Line 289 C++ clang-format.exe!clang::format::UnwrappedLineParser::parse() Line 217 C++ clang-format.exe!clang::format::TokenAnalyzer::process(bool SkipAnnotation) Line 116 C++ [Inline Frame] clang-format.exe!clang::format::internal::reformat::__l39::<lambda_6>::operator()(const clang::format::Environment &) Line 3796 C++ [Inline Frame] clang-format.exe!std::invoke(clang::format::internal::reformat::__l39::<lambda_6> &) Line 1705 C++ clang-format.exe!std::_Func_impl_no_alloc<`clang::format::internal::reformat'::`39'::<lambda_6>,std::pair<clang::tooling::Replacements,unsigned int>clang::format::Environment const &>::_Do_call(const clang::format::Environment & <_Args_0>) Line 876 C++ [Inline Frame] clang-format.exe!std::_Func_class<std::pair<clang::tooling::Replacements,unsigned int>,clang::format::Environment const &>::operator()(constclang::format::Environment &) Line 920 C++ clang-format.exe!clang::format::internal::reformat(const clang::format::FormatStyle & Style, llvm::StringRef Code, llvm::ArrayRef<clang::tooling::Range> Ranges, unsignedint FirstStartColumn, unsigned int NextStartColumn, unsigned int LastStartColumn, llvm::StringRef FileName, clang::format::FormattingAttemptStatus * Status) Line 3843 ++ clang-format.exe!clang::format::reformat(const clang::format::FormatStyle & Style, llvm::StringRef Code, llvm::ArrayRef<clang::tooling::Range> Ranges, llvm::StringRefFileName, clang::format::FormattingAttemptStatus * Status) Line 3886 C++ clang-format.exe!clang::format::format(llvm::StringRef FileName, bool ErrorOnIncompleteFormat) Line 511 C++ clang-format.exe!main(int argc, const char * * argv) Line 738 C++ ``` Happens in `main` as well as `19.1.x`, did not tried other versions.