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# Description This PR adds a `ListItem` enum to our set of AST types. It encodes the two possible expressions inside of list expression: a singular item or a spread. This is similar to the existing `RecordItem` enum. Adding `ListItem` allows us to remove the existing `Expr::Spread` case which was previously used for list spreads. As a consequence, this guarantees (via the type system) that spreads can only ever occur inside lists, records, or as command args. This PR also does a little bit of cleanup in relevant parser code. |
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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.