Method#super_method is broken for aliased methods
Method#super_method currently does not work correctly for aliased methods. Here's a simple example:
class A def m1; p :A_m1 end def m2; p :A_m2 end end class B < A def m1; p :B_m1; super end alias m2 m1 end B.new.m2 puts m = B.new.method(:m2) m.call puts m.super_method.call
:B_m1 :A_m1 :B_m1 :A_m1 :A_m2
You can see from this example that normal super lookup for B#m2 is A#m1, as B#m2 is an alias of B#m1 and super lookup follows the original method name, not the aliased name. However, the
super_method call returns a Method instance for A#m2 instead of A#m1.
There is another issue with aliases and that is when the method being aliased is from another module or class. In this case, super lookup needs to start at the super class of the defined class of the method being aliased. See https://bugs.ruby-lang.org/issues/11189#note-3 for an example of that issue.
I have a fix that handles both of these cases that I'll submit shortly via a pull request.