src/test/compile-fail/issue-7575.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 the mechanism for warning about possible missing `self` declarations.
  12
  13 use std::marker::MarkerTrait;
  14
  15 trait CtxtFn {
  16     fn f8(self, usize) -> usize;
  17     fn f9(usize) -> usize; //~ NOTE candidate
  18 }
  19
  20 trait OtherTrait : MarkerTrait {
  21     fn f9(usize) -> usize; //~ NOTE candidate
  22 }
  23
  24 // Note: this trait is not implemented, but we can't really tell
  25 // whether or not an impl would match anyhow without a self
  26 // declaration to match against, so we wind up prisizeing it as a
  27 // candidate. This seems not unreasonable -- perhaps the user meant to
  28 // implement it, after all.
  29 trait UnusedTrait : MarkerTrait {
  30     fn f9(usize) -> usize; //~ NOTE candidate
  31 }
  32
  33 impl CtxtFn for usize {
  34     fn f8(self, i: usize) -> usize {
  35         i * 4
  36     }
  37
  38     fn f9(i: usize) -> usize {
  39         i * 4
  40     }
  41 }
  42
  43 impl OtherTrait for usize {
  44     fn f9(i: usize) -> usize {
  45         i * 8
  46     }
  47 }
  48
  49 struct Myisize(isize);
  50
  51 impl Myisize {
  52     fn fff(i: isize) -> isize { //~ NOTE candidate
  53         i
  54     }
  55 }
  56
  57 trait ManyImplTrait : MarkerTrait {
  58     fn is_str() -> bool { //~ NOTE candidate
  59         false
  60     }
  61 }
  62
  63 impl ManyImplTrait for String {
  64     fn is_str() -> bool {
  65         true
  66     }
  67 }
  68
  69 impl ManyImplTrait for usize {}
  70 impl ManyImplTrait for isize {}
  71 impl ManyImplTrait for char {}
  72 impl ManyImplTrait for Myisize {}
  73
  74 fn no_param_bound(u: usize, m: Myisize) -> usize {
  75     u.f8(42) + u.f9(342) + m.fff(42)
  76             //~^ ERROR type `usize` does not implement any method in scope named `f9`
  77             //~^^ NOTE found defined static methods, maybe a `self` is missing?
  78             //~^^^ ERROR type `Myisize` does not implement any method in scope named `fff`
  79             //~^^^^ NOTE found defined static methods, maybe a `self` is missing?
  80 }
  81
  82 fn param_bound<T: ManyImplTrait>(t: T) -> bool {
  83     t.is_str()
  84     //~^ ERROR type `T` does not implement any method in scope named `is_str`
  85     //~^^ NOTE found defined static methods, maybe a `self` is missing?
  86 }
  87
  88 fn main() {
  89 }