error: unsatisfied lifetime constraints
  --> $DIR/issue-55394.rs:21:9
   |
LL |     fn new(bar: &mut Bar) -> Self {
   |                 -            ---- return type is Foo<'2>
   |                 |
   |                 let's call the lifetime of this reference `'1`
LL |         Foo { bar } //~ ERROR unsatisfied lifetime constraints
   |         ^^^^^^^^^^^ returning this value requires that `'1` must outlive `'2`

error: aborting due to previous error