chakra-core/ChakraCore

Redeclaration of a function* inside a block definition

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#6,459 创建于 2020年6月8日

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 (2 评论) (0 反应) (0 负责人)JavaScript (9,000 star) (1,374 fork)batch import
Bughelp wanted

描述

Hi everyone, I found a case of redeclaration of a generator function inside a block definition.

version: 1.11.19 OS: Linux Ubuntu 19.10 x64

steps to reproduce:

{ function* f() { yield 1 } function f() { print(2) } } f() Actual results: 2

Expected results: SyntaxError: Identifier 'f' has already been declared

V8, SpiderMonkey works as expected.

cinfuzz

贡献者指南

技术栈
javascript
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。
5
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。
over 1 week
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
JavaScript scoping rulesfunction declarations in blocksChakraCore parser internalsgenerator functions
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。
10
研究方向
Investigate ChakraCore's parser handling of function declarations inside block scopes, specifically for generator functions. The issue indicates a redeclaration error is missing. Look at the parser's validation of duplicate identifiers in block scoped function declarations, likely in the ByteCodeGenerator or Parser files. Check the ECMAScript specification for block level function declarations.