result code = 1
standard error = {
(1): error 100000: downstream tool name not known, allowed names are [ fxc, dxc, glslang, clang, visualstudio, gcc, genericcpp, nvrtc, llvm, downstream, linker ]
tests/diagnostics/command-line/x-arg-tool-unknown.slang -entry main -stage compute -o myKernel.dxbc -o myKernel.dxbc -Xthingy
                                                                                                                     ^
}
standard output = {
}