warning: denote infinite loops with `loop { ... }`
  --> $DIR/issue-27042.rs:8:9
   |
LL | /         'b:
LL | |
LL | |         while true { break }; // but here we cite the whole loop
   | |____________________________^ help: use `loop`
   |
   = note: `#[warn(while_true)]` on by default

error[E0308]: mismatched types
  --> $DIR/issue-27042.rs:6:16
   |
LL |         loop { break };
   |                ^^^^^
   |                |
   |                expected i32, found ()
   |                help: give it a value of the expected type: `break 42`
   |
   = note: expected type `i32`
              found type `()`

error[E0308]: mismatched types
  --> $DIR/issue-27042.rs:8:9
   |
LL | /         'b:
LL | |
LL | |         while true { break }; // but here we cite the whole loop
   | |____________________________^ expected i32, found ()
   |
   = note: expected type `i32`
              found type `()`

error[E0308]: mismatched types
  --> $DIR/issue-27042.rs:12:9
   |
LL | /         'c:
LL | |         for _ in None { break }; // but here we cite the whole loop
   | |_______________________________^ expected i32, found ()
   |
   = note: expected type `i32`
              found type `()`

error[E0308]: mismatched types
  --> $DIR/issue-27042.rs:15:9
   |
LL | /         'd:
LL | |         while let Some(_) = None { break };
   | |__________________________________________^ expected i32, found ()
   |
   = note: expected type `i32`
              found type `()`

error: aborting due to 4 previous errors

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