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## description this pr adds [match guards](https://doc.rust-lang.org/reference/expressions/match-expr.html#match-guards) to match patterns ```nushell match $x { _ if $x starts-with 'nu' => {}, $x => {} } ``` these work pretty much like rust's match guards, with few limitations: 1. multiple matches using the `|` are not (yet?) supported ```nushell match $num { 0 | _ if (is-odd $num) => {}, _ => {} } ``` 2. blocks cannot be used as guards, (yet?) ```nushell match $num { $x if { $x ** $x == inf } => {}, _ => {} } ``` ## checklist - [x] syntax - [x] syntax highlighting[^1] - [x] semantics - [x] tests - [x] clean up [^1]: defered for another pr |
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nu-protocol
The nu-protocol crate holds the definitions of structs/traits that are used throughout Nushell. This gives us one way to expose them to many other crates, as well as make these definitions available to each other, without causing mutually recursive dependencies.