Which one are you refering to? I only see Symbol>>#asMutator in Collections in the method category converting. It is also used in a few other places beyond generating instance variable accessors.

Bests,
Patrick

>#asMutator: is for "generate instVar accessors" code-generation, and
>that's why it's in the Tools package.
>
>IMHO, if #isMutator belongs anywhere, it isn't in Collections.
>
>Regards,
>  Chris
>
>
>
>On Wed, Mar 20, 2019 at 3:08 PM Chris Muller <asqueaker at gmail.com> wrote:
>>
>> Assuming a single-keyword is a mutator?  Object>>#at: is not a
>> mutator.  #indexOf: is not.  #first: is not.  Obviously many more..
>>
>> If API balance is the goal of this, perhaps #asMutator should be
>> removed instead.   This feels application-specific...
>>
>> On Wed, Mar 20, 2019 at 2:05 PM <commits at source.squeak.org> wrote:
>> >
>> > Patrick Rein uploaded a new version of Collections to project The Trunk:
>> > http://source.squeak.org/trunk/Collections-pre.822.mcz
>> >
>> > ==================== Summary ====================
>> >
>> > Name: Collections-pre.822
>> > Author: pre
>> > Time: 20 March 2019, 8:05:20.383677 pm
>> > UUID: 483c4461-cee4-4a4f-82d3-fbc03e7201cc
>> > Ancestors: Collections-dtl.821
>> >
>> > Adds #isMutator to Symbol which is analogous to asMutator.
>> >
>> > =============== Diff against Collections-dtl.821 ===============
>> >
>> > Item was added:
>> > + ----- Method: Symbol>>isMutator (in category 'testing') -----
>> > + isMutator
>> > +
>> > +       ^ self isKeyword and: [self numArgs = 1]!
>> >
>> >
>