In ES6, what is the meaning of the parameter [Yield], [In] in a grammar production

Coolwust coolwust at gmail.com
Mon Mar 9 08:10:48 UTC 2015


I know a production may be parameterized by suffixing the nonterminal
symbol, my question is what is the meaning of the parameter [Yield], [In]?
For example, in section 12.1, identifier expression has the syntax  below:

```
IdentifierReference [Yield] :
Identifier
[~Yield] yield
```

Thanks.
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