1error[E0106]: missing lifetime specifier
2  --> $DIR/unboxed-closure-sugar-lifetime-elision.rs:26:39
3   |
4LL |     let _: dyn Foo(&isize, &usize) -> &usize;
5   |                    ------  ------     ^ expected named lifetime parameter
6   |
7   = help: this function's return type contains a borrowed value, but the signature does not say whether it is borrowed from argument 1 or argument 2
8help: consider introducing a named lifetime parameter
9   |
10LL ~ fn main<'a>() {
11LL |     eq::< dyn for<'a> Foo<(&'a isize,), Output=&'a isize>,
12LL |           dyn Foo(&isize) -> &isize                                   >();
13LL |     eq::< dyn for<'a> Foo<(&'a isize,), Output=(&'a isize, &'a isize)>,
14LL |           dyn Foo(&isize) -> (&isize, &isize)                           >();
15LL |
16 ...
17
18error: aborting due to previous error
19
20For more information about this error, try `rustc --explain E0106`.
21