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# Description The implementation of this function had a few issues before: - It didn't check that the `cp` pointer is actually ahead of the `start` pointer, so `len` could potentially underflow and wrap around, which would be a violation of memory safety - It used `Vec::from_raw_parts` even though the buffer is borrowed, not owned. Although `std::mem::forget` is used later to ensure the destructor doesn't run, there is a risk that the destructor would run if a panic happened during `String::from_utf8_unchecked`, which would lead to a `free()` of a pointer we don't own
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.