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# NEWS for Ruby 3.1.0

This document is a list of user visible feature changes
since the **3.0.0** release, except for bug fixes.

Note that each entry is kept to a minimum, see links for details.

## Language changes

## Command line options

## Core classes updates

Outstanding ones only.

* Enumerable

    * Enumerable#compact is added. [[Feature #17312]]

* Enumerator::Lazy

    * Enumerator::Lazy#compact is added. [[Feature #17312]]

* Module

    * Module#prepend now modifies the ancestor chain if the receiver
      already includes the argument. Module#prepend still does not
      modify the ancestor chain if the receiver has already prepended
      the argument. [[Bug #17423]]

## Stdlib updates

Outstanding ones only.

## Compatibility issues

Excluding feature bug fixes.

## Stdlib compatibility issues

## C API updates

## Implementation improvements

### JIT

* `RubyVM::MJIT` is renamed to `RubyVM::JIT`.

## Static analysis

### RBS

### TypeProf

## Miscellaneous changes


[Feature #17312]: https://bugs.ruby-lang.org/issues/17312
[Bug #17423]: https://bugs.ruby-lang.org/issues/17423