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# Description I added a debug-only check that makes sure only non-other I/O errors get converted. Since tests run in debug mode, that should help us catch these errors early. I left the check out in release mode on purpose so we don't crash users who have nu as their main shell. It's similar to the debug assertions in the same file that check for unknown spans.
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.