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