src/test/compile-fail/unsized3.rs

   1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // Test sized-ness checking in substitution within fn bodies..
  12
  13 use std::marker;
  14
  15 // Unbounded.
  16 fn f1<X: ?Sized>(x: &X) {
  17     f2::<X>(x);
  18     //~^ ERROR `X: std::marker::Sized` is not satisfied
  19 }
  20 fn f2<X>(x: &X) {
  21 }
  22
  23 // Bounded.
  24 trait T {
  25     fn foo(&self) { }
  26 }
  27 fn f3<X: ?Sized + T>(x: &X) {
  28     f4::<X>(x);
  29     //~^ ERROR `X: std::marker::Sized` is not satisfied
  30 }
  31 fn f4<X: T>(x: &X) {
  32 }
  33
  34 // Test with unsized enum.
  35 enum E<X: ?Sized> {
  36     V(X),
  37 }
  38
  39 fn f5<Y>(x: &Y) {}
  40 fn f6<X: ?Sized>(x: &X) {}
  41 fn f7<X: ?Sized>(x1: &E<X>, x2: &E<X>) {
  42     f5(x1);
  43     //~^ ERROR `X: std::marker::Sized` is not satisfied
  44     f6(x2); // ok
  45 }
  46
  47
  48 // Test with unsized struct.
  49 struct S<X: ?Sized> {
  50     x: X,
  51 }
  52
  53 fn f8<X: ?Sized>(x1: &S<X>, x2: &S<X>) {
  54     f5(x1);
  55     //~^ ERROR `X: std::marker::Sized` is not satisfied
  56     f6(x2); // ok
  57 }
  58
  59 // Test some tuples.
  60 fn f9<X: ?Sized>(x1: Box<S<X>>, x2: Box<E<X>>) {
  61     f5(&(*x1, 34));
  62     //~^ ERROR `X: std::marker::Sized` is not satisfied
  63 }
  64
  65 fn f10<X: ?Sized>(x1: Box<S<X>>, x2: Box<E<X>>) {
  66     f5(&(32, *x2));
  67     //~^ ERROR `X: std::marker::Sized` is not satisfied
  68 }
  69
  70 pub fn main() {
  71 }