error[E0308]: mismatched types
   ╭▸ $DIR/non-whitespace-trimming-2.rs:6:311
   │
LL │ …= 13; let _: usize = 14; let _: usize = 15; let _: () = 42; let _: usize = 0; let _: usize = 1; let _: usize = 2; let _: usize = 3; let _:…
   │                                                     ┬─   ━━ expected `()`, found integer
   │                                                     │
   ╰╴                                                    expected due to this

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0308`.