src/test/compile-fail/coherence_inherent.rs

   1 // Copyright 2012 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 // Tests that methods that implement a trait cannot be invoked
  12 // unless the trait is imported.
  13
  14 mod Lib {
  15     pub trait TheTrait {
  16         fn the_fn(&self);
  17     }
  18
  19     pub struct TheStruct;
  20
  21     impl TheTrait for TheStruct {
  22         fn the_fn(&self) {}
  23     }
  24 }
  25
  26 mod Import {
  27     // Trait is in scope here:
  28     use Lib::TheStruct;
  29     use Lib::TheTrait;
  30
  31     fn call_the_fn(s: &TheStruct) {
  32         s.the_fn();
  33     }
  34 }
  35
  36 mod NoImport {
  37     // Trait is not in scope here:
  38     use Lib::TheStruct;
  39
  40     fn call_the_fn(s: &TheStruct) {
  41         s.the_fn(); //~ ERROR no method named `the_fn` found
  42     }
  43 }
  44
  45 fn main() {}