tests/ui/underscore-imports/basic.rs

   1 // check-pass
   2 // aux-build:underscore-imports.rs
   3
   4 #![warn(unused_imports, unused_extern_crates)]
   5
   6 #[macro_use]
   7 extern crate underscore_imports as _;
   8
   9 do_nothing!(); // OK
  10
  11 struct S;
  12
  13 mod m {
  14     pub trait Tr1 {
  15         fn tr1_is_in_scope(&self) {}
  16     }
  17     pub trait Tr2 {
  18         fn tr2_is_in_scope(&self) {}
  19     }
  20
  21     impl Tr1 for ::S {}
  22     impl Tr2 for ::S {}
  23 }
  24
  25 mod unused {
  26     use m::Tr1 as _; //~ WARN unused import
  27     use S as _; //~ WARN unused import
  28     extern crate core as _; // OK
  29 }
  30
  31 mod outer {
  32     mod middle {
  33         pub use m::Tr1 as _;
  34         pub use m::Tr2 as _; // OK, no name conflict
  35         struct Tr1; // OK, no name conflict
  36         fn check() {
  37             // Both traits are in scope
  38             ::S.tr1_is_in_scope();
  39             ::S.tr2_is_in_scope();
  40         }
  41
  42         mod inner {
  43             // `_` imports are fetched by glob imports
  44             use super::*;
  45             fn check() {
  46                 // Both traits are in scope
  47                 ::S.tr1_is_in_scope();
  48                 ::S.tr2_is_in_scope();
  49             }
  50         }
  51     }
  52
  53     // `_` imports are fetched by glob imports
  54     use self::middle::*;
  55     fn check() {
  56         // Both traits are in scope
  57         ::S.tr1_is_in_scope();
  58         ::S.tr2_is_in_scope();
  59     }
  60 }
  61
  62 fn main() {}