tests/ui/inference/auto-instantiate.rs

//! Check that type parameters in generic function arg position and in "nested" return type position
//! can be inferred on an invocation of the generic function.
//!
//! See <https://github.com/rust-lang/rust/issues/45>.

//@ run-pass

#![allow(dead_code)]
#[derive(Debug)]
struct Pair<T, U> {
    a: T,
    b: U,
}

struct Triple {
    x: isize,
    y: isize,
    z: isize,
}

fn f<T, U>(x: T, y: U) -> Pair<T, U> {
    return Pair { a: x, b: y };
}

pub fn main() {
    println!("{}", f(Triple {x: 3, y: 4, z: 5}, 4).a.x);
    println!("{}", f(5, 6).a);
}