This bug will track all NEWS items new in Ruby 2.5. This list is based off https://github.com/ruby/ruby/blob/trunk/NEWS.
Only changes relevant to JRuby are listed here. MRI-specific internal changes and features are not included.
NOTE: Pull requests should be done against the ruby-2.5
branch.
- Top-level constant look-up is removed. Feature #11547
- rescue/else/ensure are allowed inside do/end blocks. Feature #12906