src/test/ui/nll/issue-32382-index-assoc-type-with-lifetime.rs

   1 // build-pass (FIXME(62277): could be check-pass?)
   2
   3 // rust-lang/rust#32382: Borrow checker used to complain about
   4 // `foobar_3` in the `impl` below, presumably due to some interaction
   5 // between the use of a lifetime in the associated type and the use of
   6 // the overloaded operator[]. This regression test ensures that we do
   7 // not resume complaining about it in the future.
   8
   9
  10 use std::marker::PhantomData;
  11 use std::ops::Index;
  12
  13 pub trait Context: Clone {
  14     type Container: ?Sized;
  15     fn foobar_1( container: &Self::Container ) -> &str;
  16     fn foobar_2( container: &Self::Container ) -> &str;
  17     fn foobar_3( container: &Self::Container ) -> &str;
  18 }
  19
  20 #[derive(Clone)]
  21 struct Foobar<'a> {
  22     phantom: PhantomData<&'a ()>
  23 }
  24
  25 impl<'a> Context for Foobar<'a> {
  26     type Container = [&'a str];
  27
  28     fn foobar_1<'r>( container: &'r [&'a str] ) -> &'r str {
  29         container[0]
  30     }
  31
  32     fn foobar_2<'r>( container: &'r Self::Container ) -> &'r str {
  33         container.index( 0 )
  34     }
  35
  36     fn foobar_3<'r>( container: &'r Self::Container ) -> &'r str {
  37         container[0]
  38     }
  39 }
  40
  41 fn main() { }