This release brings Ruby 3.1 features and more.

New syntax

• (Proposed) Binding instance, class, global variables in pattern matching (42 => @v) (#18408).

This brings back rightward assignment: 42 => @v.

• Shorthand Hash/kwarg notation (data = {x:, y:} or foo(x:, y:)) (#15236).

• Pinning instance, class and global variables and expressions (#17724, #17411).

• Anonymous blocks def b(&); c(&); end (#11256).

• Command syntax in endless methods (def foo() = puts "bar") (#17398)

• Support omitting parentheses in one-line pattern matching ({a: 1} in a:)

New APIs

• Refinement#import_methods (#17429)

(There are some limitations though).

• MatchData#match (#18172)

• Enumerable#compact, Enumerator::Lazy#compact (#17312)

• Integer.try_convert (#15211)