// run-pass fn test_generic(expected: T, not_expected: T, eq: F) where T: Clone, F: FnOnce(T, T) -> bool, { let actual: T = if true { expected.clone() } else { not_expected }; assert!(eq(expected, actual)); } fn test_bool() { fn compare_bool(b1: bool, b2: bool) -> bool { return b1 == b2; } test_generic::(true, false, compare_bool); } #[derive(Clone)] struct Pair { a: isize, b: isize, } fn test_rec() { fn compare_rec(t1: Pair, t2: Pair) -> bool { t1.a == t2.a && t1.b == t2.b } test_generic::(Pair{a: 1, b: 2}, Pair{a: 2, b: 3}, compare_rec); } pub fn main() { test_bool(); test_rec(); }