src/test/run-pass/issue-20427.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 // aux-build:i8.rs
  12 // ignore-pretty (#23623)
  13
  14 extern crate i8;
  15 use std::string as i16;
  16 static i32: i32 = 0;
  17 const i64: i64 = 0;
  18 fn u8(f32: f32) {}
  19 fn f<f64>(f64: f64) {}
  20 enum u32 {}
  21 struct u64;
  22 trait bool {}
  23
  24 mod char {
  25     extern crate i8;
  26     static i32_: i32 = 0;
  27     const i64_: i64 = 0;
  28     fn u8_(f32: f32) {}
  29     fn f_<f64_>(f64: f64_) {}
  30     type u16_ = u16;
  31     enum u32_ {}
  32     struct u64_;
  33     trait bool_ {}
  34     mod char_ {}
  35
  36     mod str {
  37         use super::i8 as i8;
  38         use super::i32_ as i32;
  39         use super::i64_ as i64;
  40         use super::u8_ as u8;
  41         use super::f_ as f64;
  42         use super::u16_ as u16;
  43         use super::u32_ as u32;
  44         use super::u64_ as u64;
  45         use super::bool_ as bool;
  46         use super::{bool_ as str};
  47         use super::char_ as char;
  48     }
  49 }
  50
  51 trait isize_ {
  52     type isize;
  53 }
  54
  55 fn usize<'usize>(usize: &'usize usize) -> &'usize usize { usize }
  56
  57 mod reuse {
  58     use std::mem::size_of;
  59
  60     type u8 = u64;
  61     use std::string::String as i16;
  62
  63     pub fn check<u16>() {
  64         assert_eq!(size_of::<u8>(), 8);
  65         assert_eq!(size_of::<::u64>(), 0);
  66         assert_eq!(size_of::<i16>(), 3 * size_of::<*const ()>());
  67         assert_eq!(size_of::<u16>(), 0);
  68     }
  69 }
  70
  71 mod guard {
  72     pub fn check() {
  73         use std::u8; // bring module u8 in scope
  74         fn f() -> u8 { // OK, resolves to primitive u8, not to std::u8
  75             u8::max_value() // OK, resolves to associated function <u8>::max_value,
  76                             // not to non-existent std::u8::max_value
  77         }
  78         assert_eq!(f(), u8::MAX); // OK, resolves to std::u8::MAX
  79     }
  80 }
  81
  82 fn main() {
  83     let bool = true;
  84     let _ = match bool {
  85         str @ true => if str { i32 as i64 } else { i64 },
  86         false => i64,
  87     };
  88
  89     reuse::check::<u64>();
  90     guard::check();
  91 }