error[E0412]: cannot find type `MissingType` in this scope
  --> $DIR/erroneous_signature.rs:2:22
   |
LL |     fn err(&self) -> MissingType;
   |                      ^^^^^^^^^^^ not found in this scope

error[E0412]: cannot find type `MissingType` in this scope
  --> $DIR/erroneous_signature.rs:7:22
   |
LL |     fn err(&self) -> MissingType {
   |                      ^^^^^^^^^^^ not found in this scope

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0412`.