No unreachable warning for some infinite loops

[Akuli]

I'm preparing a pull request to show warnings for unreachable code, but it doesn't work in at least these two cases I tried:

def after_infinite_loop_with_variable() -> void:
    flag = True
    while flag:
        puts("hi")
    puts("yooooo wat")  # Warning: this code will never run

def after_infinite_loop_with_variable_set_after_loop() -> void:
    flag = True
    while flag:
        puts("hi")
    flag = False  # Warning: this code will never run

[Akuli]

Now the first example works as expected. The second one is still broken.