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When running the rustc test suite on AArch64, the ui/abi/variadic-ffi.rs test fails due to the following LLVM assertion:
rustc: /checkout/src/llvm-project/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp:5726: llvm::SDValue llvm::AArch64TargetLowering::LowerVAARG(llvm::SDValue, llvm::SelectionDAG&) const: Assertion `Subtarget->isTargetDarwin() && "automatic va_arg instruction only works on Darwin"' failed.
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Area: Foreign function interface (FFI)Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generationCategory: This is a bug.Target: 32-bit Arm processors (armv6, armv7, thumb...), including 64-bit Arm in AArch32 stateRelevant to the compiler team, which will review and decide on the PR/issue.