From: Stefano Mioli <stefano.mioli@...>
Date: 2011-07-18T05:37:00+09:00
Subject: Re: duplicated when clause is ignored

On 7/17/11 9:25 PM, Brian Candler wrote:
> Stefano Mioli wrote in post #1011159:
>> x = 1
>> case x
>> when 0
>> when 1
>> when 1 + 0
>> when 1
>> end
>>
>> is enough to fool iseq_set_sequence(), making it print out no warnings
>> at all, even though we still *do* have a duplicate 'when' clause (let
>> alone that there are actually 3 duplicated clauses).
>>
>> I wonder if I should file a ticket.
>
> It isn't necessarily duplicated. You might have redefined Numeric#+ to
> have a side-effect. It would be a silly thing to do, but Ruby doesn't
> know you've not done that.

True, but there are still two identical "when 1".
My point is that adding a "when 1 + 0" between them makes the warning go 
away when it shouldn't.

Or am I missing something?

-- 
Stefano Mioli