1 An unnecessary type or const parameter was given in a type alias.
3 Erroneous code example:
6 type Foo<T> = u32; // error: type parameter `T` is unused
8 type Foo<A,B> = Box<A>; // error: type parameter `B` is unused
11 Please check you didn't write too many parameters. Example:
14 type Foo = u32; // ok!
15 type Foo2<A> = Box<A>; // ok!