error[E0782]: expected a type, found a trait
  --> $DIR/avoid-ice-on-warning-3.rs:14:19
   |
LL | trait A { fn g(b: B) -> B; }
   |                   ^
   |
   = note: `B` it is dyn-incompatible, so it can't be `dyn`
help: use a new generic type parameter, constrained by `B`
   |
LL | trait A { fn g<T: B>(b: T) -> B; }
   |               ++++++    ~
help: you can also use an opaque type, but users won't be able to specify the type parameter when calling the `fn`, having to rely exclusively on type inference
   |
LL | trait A { fn g(b: impl B) -> B; }
   |                   ++++

error[E0782]: expected a type, found a trait
  --> $DIR/avoid-ice-on-warning-3.rs:14:25
   |
LL | trait A { fn g(b: B) -> B; }
   |                         ^
   |
help: `B` is dyn-incompatible, use `impl B` to return an opaque type, as long as you return a single underlying type
   |
LL | trait A { fn g(b: B) -> impl B; }
   |                         ++++

error[E0782]: expected a type, found a trait
  --> $DIR/avoid-ice-on-warning-3.rs:4:19
   |
LL | trait B { fn f(a: A) -> A; }
   |                   ^
   |
   = note: `A` it is dyn-incompatible, so it can't be `dyn`
help: use a new generic type parameter, constrained by `A`
   |
LL | trait B { fn f<T: A>(a: T) -> A; }
   |               ++++++    ~
help: you can also use an opaque type, but users won't be able to specify the type parameter when calling the `fn`, having to rely exclusively on type inference
   |
LL | trait B { fn f(a: impl A) -> A; }
   |                   ++++

error[E0782]: expected a type, found a trait
  --> $DIR/avoid-ice-on-warning-3.rs:4:25
   |
LL | trait B { fn f(a: A) -> A; }
   |                         ^
   |
help: `A` is dyn-incompatible, use `impl A` to return an opaque type, as long as you return a single underlying type
   |
LL | trait B { fn f(a: A) -> impl A; }
   |                         ++++

error: aborting due to 4 previous errors

For more information about this error, try `rustc --explain E0782`.