asMutator can produce illegal selector

[Ducasse]

"#_ asMutator >>> #_:" "#foo:: asMutator >>> #'foo::'"

the implementation should be improved

[kasperosterbye]

There is no explicit precondition in asMutator. The implicit one is: self preCondition: [self isSelector & self isBinary not]

I personally believe this implicit precondition follows from the comment: Return a setter message from a getter message, as a getter message is a selector and is not binary.

I suggest to close this one.

Perhaps it is time for a "should we add a notion of pre and post conditions for methods", as I have seen several issues in here which is basically about pre conditions not being clear.

[Ducasse]

So we should add the precondition in an explicit manner.

... 
       (self isSelector & self isBinary not) ifFalse: [ ^ self ]