[Pharo-dev] valid name for an instance variable?

is x: (with colon) a valid inst var name ? I can create the following object Object subclass: #InstVarNameTest instanceVariableNames: 'x:' classVariableNames: '' category: 'TTT' But of course, I can not write an assignment statement. I am asking because if Symbol>>#asMutator is called an a symbol with colon like x: it returns x:: It looks like that x:: is not even a valid message selector. I would like to change the asMutator method to return x: if it is called on x: (or throw an error ?) nicolai