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# Description - Error on negative argument to `last` - Add test for negative value in last Follow-up for #7178 # User-Facing Changes Breaking change: even before #7178 `last` returned an empty `list<any>` when given negative indices. Now this is an [error](https://docs.rs/nu-protocol/latest/nu_protocol/enum.ShellError.html#variant.NeedsPositiveValue) Note: In #7136 we are considering supporting negative indexing # Tests + Formatting + 1 failure test # After Submitting If your PR had any user-facing changes, update [the documentation](https://github.com/nushell/nushell.github.io) after the PR is merged, if necessary. This will help us keep the docs up to date.
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.