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PR https://github.com/rust-lang/rust/pull/66512 added the ability to set argv[0] on Command. As a side effect, it changed the Debug output to print both the program and argv[0], which in practice results in stuttery output ("echo echo foo"). This PR reverts the behaviour to the the old one, so that the command is only printed once - unless arg0 has been set. In that case it emits "[command] arg0 arg1 ...".