src/test/run-pass/rfc1623.rs

   1 // Copyright 2012 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 #![allow(dead_code)]
  12
  13 // very simple test for a 'static static with default lifetime
  14 static STATIC_STR: &str = "&'static str";
  15 const CONST_STR: &str = "&'static str";
  16
  17 // this should be the same as without default:
  18 static EXPLICIT_STATIC_STR: &'static str = "&'static str";
  19 const EXPLICIT_CONST_STR: &'static str = "&'static str";
  20
  21 // a function that elides to an unbound lifetime for both in- and output
  22 fn id_u8_slice(arg: &[u8]) -> &[u8] {
  23     arg
  24 }
  25
  26 // one with a function, argument elided
  27 static STATIC_SIMPLE_FN: &fn(&[u8]) -> &[u8] = &(id_u8_slice as fn(&[u8]) -> &[u8]);
  28 const CONST_SIMPLE_FN: &fn(&[u8]) -> &[u8] = &(id_u8_slice as fn(&[u8]) -> &[u8]);
  29
  30 // this should be the same as without elision
  31 static STATIC_NON_ELIDED_fN: &for<'a> fn(&'a [u8]) -> &'a [u8] =
  32     &(id_u8_slice as for<'a> fn(&'a [u8]) -> &'a [u8]);
  33 const CONST_NON_ELIDED_fN: &for<'a> fn(&'a [u8]) -> &'a [u8] =
  34     &(id_u8_slice as for<'a> fn(&'a [u8]) -> &'a [u8]);
  35
  36 // another function that elides, each to a different unbound lifetime
  37 fn multi_args(a: &u8, b: &u8, c: &u8) {}
  38
  39 static STATIC_MULTI_FN: &fn(&u8, &u8, &u8) = &(multi_args as fn(&u8, &u8, &u8));
  40 const CONST_MULTI_FN: &fn(&u8, &u8, &u8) = &(multi_args as fn(&u8, &u8, &u8));
  41
  42 struct Foo<'a> {
  43     bools: &'a [bool],
  44 }
  45
  46 static STATIC_FOO: Foo = Foo { bools: &[true, false] };
  47 const CONST_FOO: Foo = Foo { bools: &[true, false] };
  48
  49 type Bar<'a> = Foo<'a>;
  50
  51 static STATIC_BAR: Bar = Bar { bools: &[true, false] };
  52 const CONST_BAR: Bar = Bar { bools: &[true, false] };
  53
  54 type Baz<'a> = fn(&'a [u8]) -> Option<u8>;
  55
  56 fn baz(e: &[u8]) -> Option<u8> {
  57     e.first().map(|x| *x)
  58 }
  59
  60 static STATIC_BAZ: &Baz = &(baz as Baz);
  61 const CONST_BAZ: &Baz = &(baz as Baz);
  62
  63 static BYTES: &[u8] = &[1, 2, 3];
  64
  65 fn main() {
  66     // make sure that the lifetime is actually elided (and not defaulted)
  67     let x = &[1u8, 2, 3];
  68     STATIC_SIMPLE_FN(x);
  69     CONST_SIMPLE_FN(x);
  70
  71     STATIC_BAZ(BYTES); // neees static lifetime
  72     CONST_BAZ(BYTES);
  73
  74     // make sure this works with different lifetimes
  75     let a = &1;
  76     {
  77         let b = &2;
  78         let c = &3;
  79         CONST_MULTI_FN(a, b, c);
  80     }
  81 }