Rename of class method does nothing if class instance later assigned to None

[huguesv]

VSCode, LS 0.2.53, Python 3.7 32-bit

Given this code:

class Calculatrice():
    def add_numbers(self, first, second):
        '''this is help for adding numbers'''
        try:
            return first + second
        except:
            return None
    def multiply_numbers(self, one, two):
        return one + two

calc = Calculatrice()
calc.add_numbers(1, 5)

calc = None

calculator2 = Calculatrice()
calculator2.add_numbers(1,1)
calculator2.multiply_numbers(2, 5)

Double click on add_numbers on the line calc.add_numbers(1, 5) and press F2, enter add_values
Result: nothing happens

Delete the calc = None line

Repeat the rename, now it works

rename-noresult.log

[MikhailArkhipov]

Different from #932, appears to work for some references but not for this one specifically.

[MikhailArkhipov]

Basically variant of #682. LS does not track variable reassignments and uses the last known value which evaluates to None. Tracking all reassignments along the code flow would incur additional memory increase.