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Auto merge of #332 - kamalmarhubi:fork-enum, r=fiveop
unistd: Redesign the enum returned by fork() This changes the name of the enum returned by `fork()` to `ForkResult`, and changes the `Parent` variant to be struct-like. The result can be matched like use nix::unistd::ForkResult::*; match fork().unwrap() { Parent { child } => { ... } Child => { ... } } using the shorthand matching syntax for struct-like enum variants. This is a breaking change.
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