note: external requirements
  --> $DIR/nested-closures-regions.rs:8:24
   |
LL |     for<'a> || -> () { for<'c> |_: &'a ()| -> () {}; };
   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: defining type: main::{closure#0}::{closure#0} with closure substs [
               i8,
               extern "rust-call" fn((&(),)),
               (),
           ]
   = note: late-bound region is '?4
   = note: late-bound region is '?2
   = note: number of external vids: 3
   = note: where '?1: '?2
   = note: where '?2: '?1

note: no external requirements
  --> $DIR/nested-closures-regions.rs:8:5
   |
LL |     for<'a> || -> () { for<'c> |_: &'a ()| -> () {}; };
   |     ^^^^^^^^^^^^^^^^
   |
   = note: defining type: main::{closure#0} with closure substs [
               i8,
               extern "rust-call" fn(()),
               (),
           ]
   = note: late-bound region is '?2

note: no external requirements
  --> $DIR/nested-closures-regions.rs:7:1
   |
LL | fn main() {
   | ^^^^^^^^^
   |
   = note: defining type: main