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Fix #128930: Print documentation of CLI options missing their arg Fix #128930. Failing to give an argument to CLI options which require it now prints something like: ``` $ rustc --print error: Argument to option 'print' missing Usage: --print [crate-name|file-names|sysroot|target-libdir|cfg|check-cfg|calling-conventions|target-list|target-cpus|target-features|relocation-models|code-models|tls-models|target-spec-json|all-target-specs-json|native-static-libs|stack-protector-strategies|link-args|deployment-target] Compiler information to print on stdout ``` |
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