error[E0308]: mismatched types
  --> $DIR/loop-properly-diverging-2.rs:2:23
   |
LL |   let x: i32 = loop { break };
   |       -        ----   ^^^^^ expected `i32`, found `()`
   |       |        |
   |       |        this loop is expected to be of type `i32`
   |       expected because of this assignment
   |
help: give the `break` a value of the expected type
   |
LL |   let x: i32 = loop { break 42 };
   |                             ++

error: aborting due to 1 previous error

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