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# Description `Expression::replace_in_variable` is only called in one place, and it is called with `new_var_id` = `IN_VARIABLE_ID`. So, it ends up doing nothing. E.g., adding `debug_assert_eq!(new_var_id, IN_VARIABLE_ID)` in `replace_in_variable` does not trigger any panic. # User-Facing Changes Breaking change for `nu_protocol`.
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.