Arlen Cuss
11/10/2007 12:40:00 AM
Hi,
On Sat, 2007-11-10 at 08:19 +0900, Bob Hutchison wrote:
> On 9-Nov-07, at 6:13 PM, Roger Pack wrote:
>
> > irb(main):006:0> {}.merge {:a => 3}
> > SyntaxError: compile error
> > (irb):6: syntax error, unexpected tASSOC, expecting '}'
> > {}.merge {:a => 3}
> >
> > ???
> > {}.merge({:a => 3}) works, though. Is this a grammar problem?
>
>
> Ambiguity I guess.
>
> It is taking the {:a => 3} as a block rather than as a hash argument
> (merge is defined to allow that). The parenthesis resolves the
> ambiguity.
Right. "=>" is the tASSOC that ruby's talking about. Since it thought
you were having a block there, the only valid thing you could have
after :a would be an end of block (i.e. :a is your return value).
> Cheers,
> Bob
Arlen