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# Description After [the discussion on discord](https://discord.com/channels/601130461678272522/601130461678272524/1314600410882904125) I propose to rephrase the error message to avoid using the word `function`. From `Return used outside of function` to `Return used outside of custom command or closure`  # User-Facing Changes None # Tests + Formatting toolkit.nu fmt is good
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.