T = TypeVar('T')

class Foo:
    a: list[int32]
    b: list[int32]

def choose(t: bool, a: T, b: T) -> T:
    if t:
        return a
    else:
        return b

def set_list(ls: list[T], a: T):
    # this should fail
    l2 = ls
    l2[-1] = a

def get_foo(a: Foo) -> list[int32]:
    return a.a

def set_foo(a: Foo, b: Foo):
    a.a[0] = b.a[0]
    if True:
        c = b
        # this should fail
        c.a = a.a

def set_foo2(a: Foo, b: Foo):
    a.a[0] = b.a[0]
    if True:
        c = [Foo()]
        c[0] = a
        # this should fail
        c[0].a = b.a

def set_foo3(a: Foo, b: Foo):
    a.a[0] = b.a[0]
    if True:
        c = [Foo()]
        c[0] = a
        # this should fail
        c[0].a = get_foo(b)

def set_foo4(a: Foo, b: Foo):
    a.a[0] = b.a[0]
    if True:
        c = [Foo()]
        d = c
        d[0] = a
        # this should fail
        c[0].a = get_foo(b)

def set_foo5(a: Foo, b: Foo):
    a.a[0] = b.a[0]
    if True:
        c = [Foo()]
        d = c
        e = d
        f = e
        f[0] = a
        # this should fail
        c[0].a = get_foo(b)