error[E0308]: mismatched types
  --> $DIR/issue-98982.rs:2:5
   |
LL |   fn foo() -> i32 {
   |               --- expected `i32` because of return type
LL | /     for i in 0..0 {
LL | |         return i;
LL | |     }
   | |_____^ expected `i32`, found `()`
   |
   = note: `for` loops evaluate to unit type `()`
help: consider returning a value here
   |
LL ~     }
LL ~     /* `i32` value */
   |

error: aborting due to 1 previous error

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