scope (global) [
    [foo]             : (f : Foo) -> float
    [vertex__vs_main] : ()
    [Foo]             : {some_data : float}
    scope (Foo) [
        [some_data]       : float
    ]
    scope (foo) [
        [f]               : Foo
    ]
    scope (vertex__vs_main) [
        [d]               : float
        [f]               : Foo
    ]
]