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Auto merge of #14493 - shannmu:dynamic_switch, r=epage
feat: Add native comlpetion with CompleteEnv under the nightly ### What does this PR try to resolve? Related issue #6645 Tracking issue #14520 This PR is the first step to move cargo shell completions to native completions by using `clap_complete` crate. It makes users could complete cargo subcommand and flags. By using `clap_complete` crate, we could extend the supported shells to Bash, Zsh, Elvish, Fish, and PowerShell. However, at the current stage, the support for PowerShell in `clap_complete` is not fully developed. See clap-rs/clap#3166 to get more context about what features `clap_complete` has supported. ### How to test and review this PR? 1. Build a test environment, including the necessary short completion scripts, and the `complete` function to start an interactive shell with the help of a pty device and obtain completion results. 2. Simply test the completion results of subcommands in bash, zsh, fish, elvish.
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