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error[E0106]: missing lifetime specifier
--> $DIR/unboxed-closure-sugar-lifetime-elision.rs:26:39
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LL | let _: dyn Foo(&isize, &usize) -> &usize;
| ------ ------ ^ expected named lifetime parameter
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= 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
= note: for more information on higher-ranked polymorphism, visit https://doc.rust-lang.org/nomicon/hrtb.html
help: consider making the bound lifetime-generic with a new `'a` lifetime
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LL | let _: dyn for<'a> Foo(&'a isize, &'a usize) -> &'a usize;
| +++++++ ++ ++ ++
help: consider introducing a named lifetime parameter
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LL ~ fn main<'a>() {
LL | eq::< dyn for<'a> Foo<(&'a isize,), Output=&'a isize>,
...
LL |
LL ~ let _: dyn Foo(&'a isize, &'a usize) -> &'a usize;
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error: aborting due to previous error
For more information about this error, try `rustc --explain E0106`.
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