src/test/compile-fail/associated-types-incomplete-object.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 // Check that the user gets an errror if they omit a binding from an
  12 // object type.
  13
  14 pub trait Foo {
  15     type A;
  16     type B;
  17     fn boo(&self) -> <Self as Foo>::A;
  18 }
  19
  20 struct Bar;
  21
  22 impl Foo for isize {
  23     type A = usize;
  24     type B = char;
  25     fn boo(&self) -> usize {
  26         42
  27     }
  28 }
  29
  30 pub fn main() {
  31     let a = &42isize as &Foo<A=usize, B=char>;
  32
  33     let b = &42isize as &Foo<A=usize>;
  34     //~^ ERROR the value of the associated type `B` (from the trait `Foo`) must be specified
  35
  36     let c = &42isize as &Foo<B=char>;
  37     //~^ ERROR the value of the associated type `A` (from the trait `Foo`) must be specified
  38
  39     let d = &42isize as &Foo;
  40     //~^ ERROR the value of the associated type `A` (from the trait `Foo`) must be specified
  41     //~| ERROR the value of the associated type `B` (from the trait `Foo`) must be specified
  42 }