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# Description This PR adds a few functions to `Span` for merging spans together: - `Span::append`: merges two spans that are known to be in order. - `Span::concat`: returns a span that encompasses all the spans in a slice. The spans must be in order. - `Span::merge`: merges two spans (no order necessary). - `Span::merge_many`: merges an iterator of spans into a single span (no order necessary). These are meant to replace the free-standing `nu_protocol::span` function. The spans in a `LiteCommand` (the `parts`) should always be in order based on the lite parser and lexer. So, the parser code sees the most usage of `Span::append` and `Span::concat` where the order is known. In other code areas, `Span::merge` and `Span::merge_many` are used since the order between spans is often not known. |
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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.