src/test/ui/underscore-lifetimes.rs

   1 // run-pass
   2
   3 #![allow(dead_code)]
   4 struct Foo<'a>(&'a u8);
   5
   6 fn foo(x: &u8) -> Foo<'_> {
   7     Foo(x)
   8 }
   9
  10 fn foo2(x: &'_ u8) -> Foo<'_> {
  11     Foo(x)
  12 }
  13
  14 fn foo3(x: &'_ u8) -> Foo {
  15     Foo(x)
  16 }
  17
  18 fn foo4(_: Foo<'_>) {}
  19
  20 struct Foo2<'a, 'b> {
  21     a: &'a u8,
  22     b: &'b u8,
  23 }
  24 fn foo5<'b>(foo: Foo2<'_, 'b>) -> &'b u8 {
  25     foo.b
  26 }
  27
  28 fn main() {
  29     let x = &5;
  30     let _ = foo(x);
  31     let _ = foo2(x);
  32     let _ = foo3(x);
  33     foo4(Foo(x));
  34     let _ = foo5(Foo2 {
  35         a: x,
  36         b: &6,
  37     });
  38 }