On May 21, 2011, at 7:31 AM, Rick Waldron wrote:
> At the very bottom, there is a note that says:
>
> "With GLR parsing for the spec grammar, we could consider, e.g. (x) {x}
> instead of {|x| x} with LineTerminator excluded between parameters and body."
>
> FWIW, Speaking from a developers perspective, the syntax: (x){x} , has a very
> familiar voice that I'm confident would find immediate acceptance and fast
> adoption (I know this because it's recently been discussed by myself and
> several different groups of my developer peers)
The problem is ambiguity:
b = a.forEach (x) { x * x }
looks like a call, a.forEach(x), whose return value is assigned to b, where the
assignment expression is followed by a block statement on the same line, a
syntax error currently.
The restriction that ) and { are on the same line is necessary for this to be a
backward-compatible extension, but it doesn't help the parsing ambiguity.
Putting block parameters on the inside of the { }, even though that requires |
| or a longer way of bracketing the parameters, does not introduce this
ambiguity.
/be
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