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Title: Lexical variable declarations (`let`, `const`) unusable in repl if error thrown during declaration/first assignment · Issue #8309 · nodejs/node · GitHub

Open Graph Title: Lexical variable declarations (`let`, `const`) unusable in repl if error thrown during declaration/first assignment · Issue #8309 · nodejs/node

X Title: Lexical variable declarations (`let`, `const`) unusable in repl if error thrown during declaration/first assignment · Issue #8309 · nodejs/node

Description: Version: v.6.3.1 Platform: Linux (Ubuntu 14.04) Subsystem: repl (I think) let s = Set(); gives TypeError: Constructor Set requires 'new'. However, after this: s gives ReferenceError: s is not defined and let s = new Set(); gives TypeErro...

Open Graph Description: Version: v.6.3.1 Platform: Linux (Ubuntu 14.04) Subsystem: repl (I think) let s = Set(); gives TypeError: Constructor Set requires 'new'. However, after this: s gives ReferenceError: s is not defin...

X Description: Version: v.6.3.1 Platform: Linux (Ubuntu 14.04) Subsystem: repl (I think) let s = Set(); gives TypeError: Constructor Set requires 'new'. However, after this: s gives ReferenceError: s is n...

Opengraph URL: https://github.com/nodejs/node/issues/8309

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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Lexical variable declarations (`let`, `const`) unusable in repl if error thrown during declaration/first assignment","articleBody":"- **Version**: v.6.3.1\n- **Platform**: Linux (Ubuntu 14.04)\n- **Subsystem**: `repl` (I think)\n\n\u003c!-- Enter your issue details below this comment. --\u003e\n\n```\nlet s = Set();\n```\n\ngives `TypeError: Constructor Set requires 'new'`.\n\nHowever, after this:\n\n```\ns\n```\n\ngives `ReferenceError: s is not defined`\n\nand\n\n```\nlet s = new Set();\n```\n\ngives `TypeError: Identifier 's' has already been declared`.\n\nI'm not sure whether this is a real bug or it's expected behaviour, but it sure does seem unusual that `s` becomes unusable from this point in in the repl.\n\nThis isn't a problem when running `node` on a js file because the TypeError simply terminates execution.\n","author":{"url":"https://github.com/polybuildr","@type":"Person","name":"polybuildr"},"datePublished":"2016-08-28T12:12:35.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":29},"url":"https://github.com/8309/node/issues/8309"}

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