Katei/fix driver#10
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Mar 23, 2026
When the host compiler is built with assertions, 'swiftc -parse -'
hits an assertion failure, which fails the capability checks.
```
Assertion failed: [&]() -> bool { if (FrontendOptions::shouldActionOnlyParse(Action)) { return llvm::all_of( opts.InputsAndOutputs.getAllInputs(), [](const InputFile &IF) { const auto kind = IF.getType(); return kind == file_types::TY_Swift || kind == file_types::TY_SwiftModuleInterfaceFile; }); } return true; }() && "Only supports parsing .swift files", file C:\Users\swift-ci\jenkins\workspace\swift-main-windows-toolchain\swift\lib\FrontendTool\FrontendTool.cpp, line 1737
Please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the crash backtrace.
Stack dump:
0. Program arguments: S:\\b\\toolchains\\DEVELOPMENT-SNAPSHOT-2025-12-01-a\\LocalApp\\Programs\\Swift\\Toolchains\\0.0.0+Asserts\\usr\\bin\\swift-frontend.exe -frontend -parse -primary-file - -target x86_64-unknown-windows-msvc -disable-objc-interop -no-color-diagnostics -Xcc -fno-color-diagnostics -disable-implicit-string-processing-module-import -empty-abi-descriptor -no-auto-bridging-header-chaining -module-name main -in-process-plugin-server-path S:\\b\\toolchains\\DEVELOPMENT-SNAPSHOT-2025-12-01-a\\LocalApp\\Programs\\Swift\\Toolchains\\0.0.0+Asserts\\usr\\bin\\SwiftInProcPluginServer.dll -plugin-path S:\\b\\toolchains\\DEVELOPMENT-SNAPSHOT-2025-12-01-a\\LocalApp\\Programs\\Swift\\Toolchains\\0.0.0+Asserts\\usr\\bin -plugin-path S:\\b\\toolchains\\DEVELOPMENT-SNAPSHOT-2025-12-01-a\\LocalApp\\Programs\\Swift\\Toolchains\\0.0.0+Asserts\\usr\\local\\bin -autolink-library oldnames -autolink-library msvcrt -Xcc -D_MT -Xcc -D_DLL
1. Swift version 6.3-dev (LLVM 35f48306184cd25, Swift a69dbb3)
2. Compiling with effective version 5.10
Exception Code: 0x80000003
#0 0x00007ff7a6efdda5 (S:\b\toolchains\DEVELOPMENT-SNAPSHOT-2025-12-01-a\LocalApp\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x722dda5)
#1 0x00007ff94d8b1989 (C:\WINDOWS\System32\ucrtbase.dll+0xc1989)
#2 0x00007ff94d894ab1 (C:\WINDOWS\System32\ucrtbase.dll+0xa4ab1)
#3 0x00007ff94d8b2986 (C:\WINDOWS\System32\ucrtbase.dll+0xc2986)
#4 0x00007ff94d8b2b61 (C:\WINDOWS\System32\ucrtbase.dll+0xc2b61)
#5 0x00007ff7a02d944d (S:\b\toolchains\DEVELOPMENT-SNAPSHOT-2025-12-01-a\LocalApp\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x60944d)
#6 0x00007ff7a02db914 (S:\b\toolchains\DEVELOPMENT-SNAPSHOT-2025-12-01-a\LocalApp\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x60b914)
#7 0x00007ff7a011b19e (S:\b\toolchains\DEVELOPMENT-SNAPSHOT-2025-12-01-a\LocalApp\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x44b19e)
#8 0x00007ff7a011ad57 (S:\b\toolchains\DEVELOPMENT-SNAPSHOT-2025-12-01-a\LocalApp\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x44ad57)
#9 0x00007ff7a6f667d0 (S:\b\toolchains\DEVELOPMENT-SNAPSHOT-2025-12-01-a\LocalApp\Programs\Swift\Toolchains\0.0.0+Asserts\usr\bin\swift-frontend.exe+0x72967d0)
#10 0x00007ff94e6be8d7 (C:\WINDOWS\System32\KERNEL32.DLL+0x2e8d7)
#11 0x00007ff94fe2c40c (C:\WINDOWS\SYSTEM32\ntdll.dll+0x8c40c)
```
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