tests/ui/lifetimes/issue-79187-2.rs

   1 trait Foo {}
   2
   3 impl<F> Foo for F where F: Fn(&i32) -> &i32 {}
   4
   5 fn take_foo(_: impl Foo) {}
   6
   7 fn main() {
   8     take_foo(|a| a);
   9     //~^ ERROR implementation of `FnOnce` is not general enough
  10     //~| ERROR mismatched types
  11     take_foo(|a: &i32| a);
  12     //~^ ERROR lifetime may not live long enough
  13     //~| ERROR mismatched types
  14     take_foo(|a: &i32| -> &i32 { a });
  15     //~^ ERROR lifetime may not live long enough
  16     //~| ERROR mismatched types
  17
  18     // OK
  19     take_foo(identity(|a| a));
  20     take_foo(identity(|a: &i32| a));
  21     take_foo(identity(|a: &i32| -> &i32 { a }));
  22
  23     fn identity<F>(t: F) -> F
  24     where
  25         F: Fn(&i32) -> &i32,
  26     {
  27         t
  28     }
  29 }