error[E0308]: mismatched types
  --> $DIR/dont-suggest-through-inner-const.rs:4:9
   |
LL |         0
   |         ^ expected `()`, found integer

error[E0308]: mismatched types
  --> $DIR/dont-suggest-through-inner-const.rs:1:17
   |
LL | const fn f() -> usize {
   |          -      ^^^^^ expected `usize`, found `()`
   |          |
   |          implicitly returns `()` as its body has no tail or `return` expression

error: aborting due to 2 previous errors

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