Incompatibility in multiple assignment

描述

((x, y)) = [[1,2]]

$ ./bin/opal -e '((x, y)) = [[1,2]]; p(["x", x, "y", y])'
["x", [1, 2], "y", nil]
$ ruby -e '((x, y)) = [[1,2]]; p(["x", x, "y", y])'
["x", 1, "y", 2]

贡献者指南

技术栈

rubyjavascript

领域

backend

议题类型

bug

难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。

4

预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。

1-2 days

活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。

stale

清晰度议题是否清楚说明期望改动、验收标准和下一步。

clear

前置要求

Ruby syntaxOpal compiler structuremultiple assignment semantics

新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。

30

研究方向

Investigate Opal's parser and compiler for multiple assignment. Compare with Ruby's behavior for nested destructuring. Likely the bug is in handling of parentheses in assignment; look at files like `lib/opal/parser.rb` or `lib/opal/compiler.rb`. Note that the issue has no comments or linked PRs, so the fix is unclaimed.