src/test/ui/pptypedef.rs

fn let_in<T, F>(x: T, f: F) where F: FnOnce(T) {}

fn main() {
    let_in(3u32, |i| { assert!(i == 3i32); });
    //~^ ERROR mismatched types
    //~| expected u32, found i32

    let_in(3i32, |i| { assert!(i == 3u32); });
    //~^ ERROR mismatched types
    //~| expected i32, found u32
}