The second half of the documentation reads

the right side is a method name or a simple scalar variable containing either the method name or a subroutine reference, and the left side must be either an object (a blessed reference) or a class name (that is, a package name). See perlobj.

I don't see how it could be clearer that a reference is allowed.

In reply to Re^5: OOP: ->Coderef for calling Private Methods (possibilites?) by ikegami
in thread OOP: Obj->Coderef for calling Private Methods by LanX

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