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@@ -6,6 +6,7 @@ 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 + * Pin operator now takes an expression. [[Feature #17411]] ```ruby @@ -13,6 +14,50 @@ Note that each entry is kept to a minimum, see links for details. #=> [[3, 5], [5, 7], [11, 13]] ``` +* Multiple assignment evaluation order has been made consistent with + single assignment evaluation order. With single assignment, Ruby + uses a left-to-right evaluation order. With this code: + + ```ruby + foo[0] = bar + ``` + + The following evaluation order is used: + + 1. `foo` + 2. `bar` + 3. `[]=` called on the result of `foo` + + In Ruby before 3.1.0, multiple assignment did not follow this + evaluation order. With this code: + + ```ruby + foo[0], bar.baz = a, b + ``` + + Versions of Ruby before 3.1.0 would evaluate in the following + order + + 1. `a` + 2. `b` + 3. `foo` + 4. `[]=` called on the result of `foo` + 5. `bar` + 6. `baz=` called on the result of `bar` + + Starting in Ruby 3.1.0, evaluation order is now consistent with + single assignment, with the left hand side being evaluated before + the right hand side: + + 1. `foo` + 2. `bar` + 3. `a` + 4. `b` + 5. `[]=` called on the result of `foo` + 6. `baz=` called on the result of `bar` + + [[Bug #4443]] + ## Command line options ## Core classes updates @@ -96,6 +141,7 @@ Excluding feature bug fixes. ## Miscellaneous changes +[Bug #4443]: https://bugs.ruby-lang.org/issues/4443 [Feature #12194]: https://bugs.ruby-lang.org/issues/12194 [Feature #14256]: https://bugs.ruby-lang.org/issues/14256 [Feature #15198]: https://bugs.ruby-lang.org/issues/15198 |