On 08/03/2018 02:37 PM, Tab Atkins Jr. wrote:
Yes, they were reserved because they were the Java reserved keywords,
with the intention that we might add more Java features later in the
langauge's evolution. That has no bearing on their use today.
That's exactly what we did. In the early days of ECMAScript we had no plans to
use those but reserved them just in case. Some of the ones we reserved later
accidentally became unreserved.
Introducing a new keyword-based feature when that keyword isn't reserved leads to severe
complications and arbitrary [no linebreak here] rules. The nastiest cover grammars are
some of the consequences of things like being able to use "async" as a function
name.
Waldemar
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