• Date you used flake8-return: 2023-03-16
• flake8-return version used, if any: 1.2.0
• Python version, if any: 3.10.9
• Operating System: Linux

Description

def foo(a):
    if ...:
        a = 2
    return a

$ flake8 foo.py --select=R
foo.py:4:12: R504 unnecessary variable assignment before return statement.

variables that are function parameters should not be treated as unnecessary, cursory skim of https://github.com/afonasev/flake8-return/blob/master/flake8_return/mixins/unnecessary_assign.py looks like it doesn't look at FunctionDef or AsyncFunctionDef at all which explains it.