src/test/compile-fail/dep-graph-trait-impl.rs

   1 // Copyright 2012-2014 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 that when a trait impl changes, fns whose body uses that trait
  12 // must also be recompiled.
  13
  14 // compile-flags: -Z query-dep-graph
  15
  16 #![feature(rustc_attrs)]
  17 #![allow(warnings)]
  18
  19 fn main() { }
  20
  21 pub trait Foo: Sized {
  22     fn method(self) { }
  23 }
  24
  25 mod x {
  26     use Foo;
  27
  28     #[rustc_if_this_changed]
  29     impl Foo for char { }
  30
  31     impl Foo for u32 { }
  32 }
  33
  34 mod y {
  35     use Foo;
  36
  37     #[rustc_then_this_would_need(TypeckItemBody)] //~ ERROR OK
  38     #[rustc_then_this_would_need(TransCrateItem)] //~ ERROR OK
  39     pub fn with_char() {
  40         char::method('a');
  41     }
  42
  43     #[rustc_then_this_would_need(TypeckItemBody)] //~ ERROR OK
  44     #[rustc_then_this_would_need(TransCrateItem)] //~ ERROR OK
  45     pub fn take_foo_with_char() {
  46         take_foo::<char>('a');
  47     }
  48
  49     #[rustc_then_this_would_need(TypeckItemBody)] //~ ERROR OK
  50     #[rustc_then_this_would_need(TransCrateItem)] //~ ERROR OK
  51     pub fn with_u32() {
  52         u32::method(22);
  53     }
  54
  55     #[rustc_then_this_would_need(TypeckItemBody)] //~ ERROR OK
  56     #[rustc_then_this_would_need(TransCrateItem)] //~ ERROR OK
  57     pub fn take_foo_with_u32() {
  58         take_foo::<u32>(22);
  59     }
  60
  61     pub fn take_foo<T:Foo>(t: T) { }
  62 }
  63
  64 mod z {
  65     use y;
  66
  67     // These are expected to yield errors, because changes to `x`
  68     // affect the BODY of `y`, but not its signature.
  69     #[rustc_then_this_would_need(TypeckItemBody)] //~ ERROR no path
  70     #[rustc_then_this_would_need(TransCrateItem)] //~ ERROR no path
  71     pub fn z() {
  72         y::with_char();
  73         y::with_u32();
  74     }
  75 }