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// run-pass #![allow(dead_code)] struct S<T, U = u16> { a: T, b: U, } trait Tr { type A; } impl Tr for u8 { type A = S<u8, u16>; } fn f<T: Tr<A = S<u8>>>() { let s = T::A { a: 0, b: 1 }; match s { T::A { a, b } => { assert_eq!(a, 0); assert_eq!(b, 1); } } } fn main() { f::<u8>(); }