tests/ui/regions/regions-lub-ref-ref-rc.rs

   1 // run-pass
   2 #![allow(dead_code)]
   3 // Test a corner case of LUB coercion. In this case, one arm of the
   4 // match requires a deref coercion and the other doesn't, and there
   5 // is an extra `&` on the `rc`. We want to be sure that the lifetime
   6 // assigned to this `&rc` value is not `'a` but something smaller.  In
   7 // other words, the type from `rc` is `&'a Rc<String>` and the type
   8 // from `&rc` should be `&'x &'a Rc<String>`, where `'x` is something
   9 // small.
  10
  11 use std::rc::Rc;
  12
  13 #[derive(Clone)]
  14 enum Cached<'mir> {
  15     Ref(&'mir String),
  16     Owned(Rc<String>),
  17 }
  18
  19 impl<'mir> Cached<'mir> {
  20     fn get_ref<'a>(&'a self) -> &'a String {
  21         match *self {
  22             Cached::Ref(r) => r,
  23             Cached::Owned(ref rc) => &rc,
  24         }
  25     }
  26 }
  27
  28 fn main() { }