src/test/compile-fail/dep-graph-type-alias.rs

   1 // Copyright 2016 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
  12 // Test that changing what a `type` points to does not go unnoticed.
  13
  14 // compile-flags: -Z query-dep-graph
  15
  16 #![feature(rustc_attrs)]
  17 #![allow(dead_code)]
  18 #![allow(unused_variables)]
  19
  20 fn main() { }
  21
  22
  23 #[rustc_if_this_changed]
  24 type TypeAlias = u32;
  25
  26 // The type alias directly affects the type of the field,
  27 // not the enclosing struct:
  28 #[rustc_then_this_would_need(TypeOfItem)] //~ ERROR no path
  29 struct Struct {
  30     #[rustc_then_this_would_need(TypeOfItem)] //~ ERROR OK
  31     x: TypeAlias,
  32     y: u32
  33 }
  34
  35 #[rustc_then_this_would_need(TypeOfItem)] //~ ERROR no path
  36 enum Enum {
  37     Variant1 {
  38         #[rustc_then_this_would_need(TypeOfItem)] //~ ERROR OK
  39         t: TypeAlias
  40     },
  41     Variant2(i32)
  42 }
  43
  44 #[rustc_then_this_would_need(TypeOfItem)] //~ ERROR no path
  45 trait Trait {
  46     #[rustc_then_this_would_need(FnSignature)] //~ ERROR OK
  47     fn method(&self, _: TypeAlias);
  48 }
  49
  50 struct SomeType;
  51
  52 #[rustc_then_this_would_need(TypeOfItem)] //~ ERROR no path
  53 impl SomeType {
  54     #[rustc_then_this_would_need(FnSignature)] //~ ERROR OK
  55     #[rustc_then_this_would_need(TypeckTables)] //~ ERROR OK
  56     fn method(&self, _: TypeAlias) {}
  57 }
  58
  59 #[rustc_then_this_would_need(TypeOfItem)] //~ ERROR OK
  60 type TypeAlias2 = TypeAlias;
  61
  62 #[rustc_then_this_would_need(FnSignature)] //~ ERROR OK
  63 #[rustc_then_this_would_need(TypeckTables)] //~ ERROR OK
  64 fn function(_: TypeAlias) {
  65
  66 }