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# Description This adds an extension trait to `Result` that wraps errors in `Spanned`, saving the effort of calling `.map_err(|err| err.into_spanned(span))` every time. This will hopefully make it even more likely that someone will want to use a spanned `io::Error` and make it easier to remove the impl for `From<io::Error> for ShellError` because that doesn't have span information.
Nushell core libraries and plugins
These sub-crates form both the foundation for Nu and a set of plugins which extend Nu with additional functionality.
Foundational libraries are split into two kinds of crates:
- Core crates - those crates that work together to build the Nushell language engine
- Support crates - a set of crates that support the engine with additional features like JSON support, ANSI support, and more.
Plugins are likewise also split into two types:
- Core plugins - plugins that provide part of the default experience of Nu, including access to the system properties, processes, and web-connectivity features.
- Extra plugins - these plugins run a wide range of different capabilities like working with different file types, charting, viewing binary data, and more.