I'm aware it's specified as a cover grammar, which is the easiest way I'm aware of to do it in a traditional declarative grammar. If you're writing a parser, though, you'll probably be using a mixture of lookahead and speculative parsing, or something to that effect, in practice, since it's faster.
On Thu, May 19, 2016, 16:38 Kevin Smith <[email protected]> wrote: > I will note that JavaScript does already require n-token lookahead worst >> case to disambiguate arrow functions from sequence expressions. >> > The syntax is actually specified in terms of cover grammars, not arbitrary > lookahead. > >
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