// run-pass use std::marker::PhantomData; pub trait DataBind { type Data; } impl DataBind for Global { type Data = T; } pub struct Global(PhantomData); pub struct Data { pub offsets: as DataBind>::Data, } fn create_data() -> Data { let mut d = Data { offsets: [1, 2] }; d.offsets[0] = 3; d } fn main() { let d = create_data(); assert_eq!(d.offsets[0], 3); assert_eq!(d.offsets[1], 2); }