error[E0412]: cannot find type `Color` in this scope
  --> $DIR/trait-selection-ice-84727.rs:5:17
   |
LL |     foreground: Color<Fg>,
   |                 ^^^^^ not found in this scope

error[E0412]: cannot find type `Color` in this scope
  --> $DIR/trait-selection-ice-84727.rs:7:17
   |
LL |     background: Color<Bg>,
   |                 ^^^^^ not found in this scope

error[E0412]: cannot find type `Color` in this scope
  --> $DIR/trait-selection-ice-84727.rs:18:16
   |
LL |     Self: Over<Color<BottomBg>, Cell<NewFg>>,
   |                ^^^^^ not found in this scope

error[E0412]: cannot find type `NewBg` in this scope
  --> $DIR/trait-selection-ice-84727.rs:32:27
   |
LL |     fn over(self) -> Cell<NewBg> {
   |                           ^^^^^ not found in this scope
   |
help: you might be missing a type parameter
   |
LL | impl<'b, TopFg, TopBg, BottomFg, BottomBg, NewBg> Over<&Cell<BottomFg, BottomBg>, ()>
   |                                          +++++++

error[E0308]: mismatched types
  --> $DIR/trait-selection-ice-84727.rs:21:22
   |
LL |     fn over(self) -> Cell<NewFg> {
   |        ----          ^^^^^^^^^^^ expected `Cell<NewFg>`, found `()`
   |        |
   |        implicitly returns `()` as its body has no tail or `return` expression
LL |
LL |         self.over();
   |                    - help: remove this semicolon to return this value
   |
   = note: expected struct `Cell<NewFg>`
           found unit type `()`

error: aborting due to 5 previous errors

Some errors have detailed explanations: E0308, E0412.
For more information about an error, try `rustc --explain E0308`.