src/test/compile-fail/dep-graph-caller-callee.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 immediate callers have to change when callee changes, but
  12 // not callers' callers.
  13
  14 // compile-flags: -Z query-dep-graph
  15
  16 #![feature(rustc_attrs)]
  17 #![allow(dead_code)]
  18
  19 fn main() { }
  20
  21 mod x {
  22     #[rustc_if_this_changed]
  23     pub fn x() { }
  24 }
  25
  26 mod y {
  27     use x;
  28
  29     // These dependencies SHOULD exist:
  30     #[rustc_then_this_would_need(TypeckItemBody)] //~ ERROR OK
  31     #[rustc_then_this_would_need(TransCrateItem)] //~ ERROR OK
  32     pub fn y() {
  33         x::x();
  34     }
  35 }
  36
  37 mod z {
  38     use y;
  39
  40     // These are expected to yield errors, because changes to `x`
  41     // affect the BODY of `y`, but not its signature.
  42     #[rustc_then_this_would_need(TypeckItemBody)] //~ ERROR no path
  43     #[rustc_then_this_would_need(TransCrateItem)] //~ ERROR no path
  44     pub fn z() {
  45         y::y();
  46     }
  47 }