Rust Platform

🎯 In Python, closures can read variables from their enclosing scope freely, but modifying them requires the nonlocal keyword:

def toggler(): state = False def flip(): nonlocal state state = not state return state return flip t = toggler() t() # True t() # False

Without nonlocal, Python treats state as a new local variable and you get an UnboundLocalError. Rust handles this differently — through three capture modes and three closure traits.

Three ways …