Allen Wirfs-Brock wrote:
On Jan 6, 2015, at 5:34 PM, Gary Guo wrote:
I found that even without shorthand, the object literal can still be
ambiguous with block.
Yes, but not in the context of a ConciseBody of an ArrowFunction.
The grammar for ConciseBody
(http://people.mozilla.org/~jorendorff/es6-draft.html#sec-arrow-function-definitions
<http://people.mozilla.org/%7Ejorendorff/es6-draft.html#sec-arrow-function-definitions>
) ensures that there is no ambiguity. If a ConciseBody starts with a {
then it must parse as either a well-formed bracketed FunctionBody or
as a syntax error.
There is no guessing. { means statements follow rather than an expression.
Indeed. Perhaps Gary meant less formal ambiguity, as Caitlin did earlier
in thread -- in which case we could future-proof or perhaps just help
people by proscribing { L: 42 } from being parsed as a ConciseBody. I'm
curious to know what you think about this idea. It seems best done with
parametric productions, but I haven't worked it out yet.
/be
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