SwiftParser/StringLiterals.swift:346: Fatal error: String segment produced by the lexer should not have unexpected text or trivia because we would drop it during post-processing Please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the crash backtrace. Stack dump: 0. Program arguments: /Users/hamish/src/swift-dev/build/Fuzz/swift-macosx-arm64/bin/swift-frontend -typecheck -sdk /Users/hamish/src/MacOSX.sdk /Users/hamish/src/swift-test-arena/main.swift 1. Swift version 6.2-dev (LLVM 4e0a8255b12089a, Swift 1398b316fee6062) 2. Compiling with effective version 5.10 3. While evaluating request ParseTopLevelDeclsRequest(source_file "/Users/hamish/src/swift-test-arena/main.swift") 4. While evaluating request ParseSourceFileRequest(source_file "/Users/hamish/src/swift-test-arena/main.swift") 5. With parser at source location: /Users/hamish/src/swift-test-arena/main.swift:1236:17 Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it): 0 swift-frontend 0x000000010c2b719c llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 56 1 swift-frontend 0x000000010c2b58ec llvm::sys::RunSignalHandlers() + 112 2 swift-frontend 0x000000010c2b77e4 SignalHandler(int, __siginfo*, void*) + 296 3 libsystem_platform.dylib 0x0000000182672744 _sigtramp + 56 4 libswiftCore.dylib 0x0000000195d809ac $ss17_assertionFailure__4file4line5flagss5NeverOs12StaticStringV_SSAHSus6UInt32VtF + 176 5 lib_CompilerSwiftParser.dylib 0x0000000119801fbc $s20_CompilerSwiftParser0C0V33postProcessMultilineStringLiteral33_78149DB072C20084E7D780D86E26C3AFLL03rawG15DelimitersToken9openQuote8segments05closeU0Say01_aB6Syntax03RawsX0VG023unexpectedBeforeOpeningU0_AL07openingU0SayAJ0ygh11SegmentListX0V7ElementOGAhM0z13BeforeClosingU0AL07closingU0tALSg_AltLtF + 3080 6 lib_CompilerSwiftParser.dylib 0x00000001197fef84 $s20_CompilerSwiftParser0C0V17parseSimpleString01_aB6Syntax03Rawef11LiteralExprG0VyF + 3908 7 lib_CompilerSwiftParser.dylib 0x000000011972dce8 $s20_CompilerSwiftParser0C0V33parsePoundSourceLocationDirective01_aB6Syntax03RawefgI0VyF + 2968 8 lib_CompilerSwiftParser.dylib 0x0000000119809d74 $s20_CompilerSwiftParser0C0V9parseItem33_008C1B0E0A90478841CED0DF9A7053A1LL12isAtTopLevel13allowInitDecl01_aB6Syntax012RawCodeBlockeU0V0E0OSb_SbtF + 132 9 lib_CompilerSwiftParser.dylib 0x00000001198095e8 $s20_CompilerSwiftParser0C0V18parseCodeBlockItem12isAtTopLevel13allowInitDecl01_aB6Syntax03RawefgO0VSgSb_SbtF + 840 10 lib_CompilerSwiftParser.dylib 0x0000000119806b30 $s20_CompilerSwiftParser0C0V22parseCodeBlockItemList12isAtTopLevel13allowInitDecl5until01_aB6Syntax03RawefghQ0VSb_S2bACzXEtF05$s20_ab17Parser0C0V27parseklef25Items01_aB6Syntax03Rawgh8gH15J0VyFSbACzXEfU_Tf1nncn_n + 100 11 lib_CompilerSwiftParser.dylib 0x000000011987024c $s20_CompilerSwiftSyntax010SourceFileC0V01_aB6ParserE5parse4fromAcD0F0Vz_tFZ + 132 12 swift-frontend 0x00000001078997a0 $s11swiftASTGen15parseSourceFile6buffer10moduleName8filename14declContextPtr4kindSVSo16BridgedStringRefV_A2ISvSgSo0n9GenerateddE4KindVtF + 1188