from annotationlib import Format, get_annotations
def works_global():
    class Demo:
        x: sequence_a[int]
    fwdref = get_annotations(Demo, format=Format.FORWARDREF)['x']
    print(f"Global {fwdref!r}")
    global sequence_a
    sequence_a = list
    evaluated = fwdref.evaluate()
    print(f"Evaluated {evaluated!r}")
def works_nongeneric():
    class Demo:
        nonlocal alias # Optional
        x: alias
    fwdref = get_annotations(Demo, format=Format.FORWARDREF)['x']
    print(f"Global {fwdref!r}")
    alias = int
    evaluated = fwdref.evaluate()
    print(f"Evaluated {evaluated!r}")
def fails():
    class Demo:
        nonlocal sequence_b
        x: sequence_b[int]
    fwdref = get_annotations(Demo, format=Format.FORWARDREF)['x']
    print(f"Local {fwdref!r}")
    sequence_b = list
    evaluated = fwdref.evaluate() # NameError
    print(f"Evaluated {evaluated!r}")
works_global()
works_nongeneric()
fails()