ruby/NEWS.md

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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]]
* Struct
* Passing only keyword arguments to Struct#initialize is warned.
You need to use a Hash literal to set a Hash to a first member.
[[Feature #16806]]
* Queue
* Queue#initialize now accepts an Enumerable of initial values.
[[Feature #17327]]
* Thread::Backtrace
* Thread::Backtrace.limit, which returns the value to limit backtrace
length set by `--backtracse-limit` command line option, is added.
[[Feature #17479]]
* $LOAD_PATH
* $LOAD_PATH.resolve_feature_path does not raise. [[Feature #16043]]
## Stdlib updates
Outstanding ones only.
## Compatibility issues
Excluding feature bug fixes.
## Stdlib compatibility issues
* `ERB#initialize` warns `safe_level` and later arguments even without -w.
[[Feature #14256]]
## C API updates
## Implementation improvements
### JIT
* `RubyVM::MJIT` is renamed to `RubyVM::JIT`.
## Static analysis
### RBS
### TypeProf
## Miscellaneous changes
[Feature #14256]: https://bugs.ruby-lang.org/issues/14256
[Feature #16043]: https://bugs.ruby-lang.org/issues/16043
[Feature #16806]: https://bugs.ruby-lang.org/issues/16806
[Feature #17312]: https://bugs.ruby-lang.org/issues/17312
[Feature #17327]: https://bugs.ruby-lang.org/issues/17327
[Bug #17423]: https://bugs.ruby-lang.org/issues/17423
[Feature #17479]: https://bugs.ruby-lang.org/issues/17479