Inline method refactoring changes variables names after applying the transformation

[Researcher]

Inline method refactoring changes field signatures and generates uninitialized variables

Steps to reproduce the behavior:

1. Code before refactoring:

def _calculate_tk(source):
    def RL(a, b):
        for c in range(0, len(b) - 2, 3):
            xa = a & ((1 << 32) - 1)
            d = ord(b[c + 2]) - 87 if b[c + 2] >= 'a' else int(b[c + 2])
            d = xa >> d if b[c + 1] == '+' else xa << d
            a = a + d & 4294967295 if b[c] == '+' else a ^ d
        return (a & ((1 << (32 - 1)) - 1)) - (a & (1 << (32 - 1)))

    b = 406398
    d = source.encode('utf-8')
    a = b

    for di in d:
        a = RL(a + di, "+-a^+6")

    a = RL(a, "+-3^+b+-f")
    
    return '{0:d}.{1:d}'.format(a, a ^ b)

2. Apply the Inline Method refactoring to '_calculate_tk.RL'

3. Expected code after refactoring:

def _calculate_tk(source):
    b = 406398
    d = source.encode('utf-8')
    a = b

    for di in d:
        for c in range(0, len("+-a^+6") - 2, 3):
            xa = a + di & ((1 << 32) - 1)
            d = ord("+-a^+6"[c + 2]) - 87 if "+-a^+6"[c + 2] >= 'a' else int("+-a^+6"[c + 2])
            d = xa >> d if "+-a^+6"[c + 1] == '+' else xa << d
            a = a + di + d & 4294967295 if "+-a^+6"[c] == '+' else a + di ^ d
        a = (a + di & ((1 << (32 - 1)) - 1)) - (a + di & (1 << (32 - 1)))

    for c in range(0, len("+-3^+b+-f") - 2, 3):
        xa = a & ((1 << 32) - 1)
        d = ord("+-3^+b+-f"[c + 2]) - 87 if "+-3^+b+-f"[c + 2] >= 'a' else int("+-3^+b+-f"[c + 2])
        d = xa >> d if "+-3^+b+-f"[c + 1] == '+' else xa << d
        a = a + d & 4294967295 if "+-3^+b+-f"[c] == '+' else a ^ d
    a = (a & ((1 << (32 - 1)) - 1)) - (a & (1 << (32 - 1)))

    return '{0:d}.{1:d}'.format(a, a ^ b)

4. The result of the program after applied transformation:

def _calculate_tk(source):
    b = 406398
    d = source.encode('utf-8')
    a = b

    for di in d:
        for __0__c in range(0, len("+-a^+6") - 2, 3):
            __0__xa = __0__a + di & ((1 << 32) - 1)
            __0__d = ord("+-a^+6"[__0__c + 2]) - 87 if "+-a^+6"[__0__c + 2] >= 'a' else int("+-a^+6"[__0__c + 2])
            __0__d = __0__xa >> __0__d if "+-a^+6"[__0__c + 1] == '+' else __0__xa << __0__d
            __0__a = __0__a + di + __0__d & 4294967295 if "+-a^+6"[__0__c] == '+' else __0__a + di ^ __0__d
        a = (__0__a + di & ((1 << (32 - 1)) - 1)) - (__0__a + di & (1 << (32 - 1)))

    for __1__c in range(0, len("+-3^+b+-f") - 2, 3):
        __1__xa = __1__a & ((1 << 32) - 1)
        __1__d = ord("+-3^+b+-f"[__1__c + 2]) - 87 if "+-3^+b+-f"[__1__c + 2] >= 'a' else int("+-3^+b+-f"[__1__c + 2])
        __1__d = __1__xa >> __1__d if "+-3^+b+-f"[__1__c + 1] == '+' else __1__xa << __1__d
        __1__a = __1__a + __1__d & 4294967295 if "+-3^+b+-f"[__1__c] == '+' else __1__a ^ __1__d
    a = (__1__a & ((1 << (32 - 1)) - 1)) - (__1__a & (1 << (32 - 1)))
    
    return '{0:d}.{1:d}'.format(a, a ^ b)