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unsized2.rs
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unsized2.rs
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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#![feature(struct_variant)]
// Test sized-ness checking in substitution.
// Unbounded.
fn f1<type X>(x: &X) {
f1::<X>(x);
}
fn f2<X>(x: &X) {
f1::<X>(x);
f2::<X>(x);
}
// Bounded.
trait T for type {}
fn f3<type X: T>(x: &X) {
f3::<X>(x);
}
fn f4<X: T>(x: &X) {
f3::<X>(x);
f4::<X>(x);
}
// Self type.
trait T2 for type {
fn f() -> ~Self;
}
struct S;
impl T2 for S {
fn f() -> ~S {
~S
}
}
fn f5<type X: T2>(x: &X) {
let _: ~X = T2::f();
}
fn f6<X: T2>(x: &X) {
let _: ~X = T2::f();
}
trait T3 for type {
fn f() -> ~Self;
}
impl T3 for S {
fn f() -> ~S {
~S
}
}
fn f7<type X: T3>(x: &X) {
// This is valid, but the unsized bound on X is irrelevant because any type
// which implements T3 must have statically known size.
let _: ~X = T3::f();
}
trait T4<X> {
fn m1(x: &T4<X>);
fn m2(x: &T5<X>);
}
trait T5<type X> {
// not an error (for now)
fn m1(x: &T4<X>);
fn m2(x: &T5<X>);
}
trait T6<X: T> {
fn m1(x: &T4<X>);
fn m2(x: &T5<X>);
}
trait T7<type X: T> {
// not an error (for now)
fn m1(x: &T4<X>);
fn m2(x: &T5<X>);
}
// The last field in a struct or variant may be unsized
struct S2<type X> {
f: X,
}
struct S3<type X> {
f1: int,
f2: X,
}
enum E<type X> {
V1(X),
V2{x: X},
V3(int, X),
V4{u: int, x: X},
}
pub fn main() {
}