error[E0308]: mismatched types
  --> $DIR/non-whitespace-trimming.rs:4:241
   |
LL | ...) = (); let _: () = (); let _: () = (); let _: () = 42; let _: () = (); let _: () = (); let _: () = (); let _: () = (); let _: () = ()...
   |                                                        ^^ expected (), found integer

error: aborting due to previous error

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