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From Ralph Johnson <john...@cs.uiuc.edu>
Subject Re: change in definition of Groovy?
Date Tue, 17 Nov 2015 21:19:28 GMT
Thanks for your reply!   I had made (and tested) a fix before sending the
mail, but apparently the bug wasn't what I thought it was.  So, I'll have
to dig deeper.

-Ralph

On Tue, Nov 17, 2015 at 2:39 PM, Tankerbay <tankerbay@gmail.com> wrote:

> +1 for sdkman.io!
>
> Sent from my phone.  Please excuse the mess.
> On Nov 17, 2015 11:16 AM, "Søren Berg Glasius" <soeren@glasius.dk> wrote:
>
>> Hi Ralph,
>>
>> Had to fire up Groovy Console (2.4.5) and try it out:
>>
>> class Obj {
>>    Map foo
>> }
>>
>> obj = new Obj()
>>
>> obj.foo?.fee = 'some value'
>>
>> assert obj.foo?.fee == null
>>
>> I do not see an error, so unless I misunderstand your problem, I do not
>> think it's wrong.
>>
>> To verify, I did the same with Groovy 2.1.9, same result. Then with
>> Groovy 1.8.9, just to be sure, also same result.
>>
>> PS: Just got to love sdkman.io when testing such code....
>>
>> Best regards / Med venlig hilsen,
>> Søren Berg Glasius
>>
>> Hedevej 1, Gl. Rye, 8680 Ry, Denmark
>> Mobile: +45 40 44 91 88, Skype: sbglasius
>> --- Press ESC once to quit - twice to save the changes.
>>
>> On November 17, 2015 at 8:04:55 PM, Ralph Johnson (johnson@cs.uiuc.edu)
>> wrote:
>>
>> I am in the process of converting a large Groovy program from 2.1 to 2.4.
>>   A year or two ago I converted it from (I think) 1.8 to 2.1.
>>
>> I found an odd assignment.
>>
>> obj.foo?.fee = v
>>
>> The code assumed that if obj.foo was null, this assignment statement was
>> skipped.   It does not work that way in 2.4, and I had to rewrite it to
>> make the code work.  I had no idea that you could use the safe
>> dereferencing operator on the left-hand-side of an assignment, I always
>> thought it was only on the right-hand-side.   I imagine that the author of
>> this code was exploiting a bug in Groovy, that Groovy was never supposed to
>> allow this.   Somewhere between 2.1 and 2.4, this bug got fixed.    Or was
>> there a change in the definition of Groovy?   Or am I completely missing
>> the point?
>>
>> -Ralph Johnson
>>
>>

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