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Early error behavior is proposed to be deferred (i.e. made lazy), not skipped. Additionally, it is one of many things that require frontends to look at every character of the source.

I contend that the text format for JS is no way easy to implement or extend, though I can only offer my personal experience as an engine hacker.

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If early error is deferred then it's no longer early... that's all I meant by skipped. It still is a semantic change that's unrelated to a binary AST.

Indeed it's a semantic change. Are you saying you'd like that change to be proposed separately? That can't be done for the text format for the obvious compat reasons. It also has very little value on its own, as it is only one of many things that prevents actually skipping inner functions during parsing.

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