Error code E0403

Some type parameters have the same name.

Erroneous code example:

#![allow(unused)] fn main() { fn f<T, T>(s: T, u: T) {} // error: the name `T` is already used for a generic // parameter in this item's generic parameters }

Please verify that none of the type parameters are misspelled, and rename any clashing parameters. Example:

#![allow(unused)] fn main() { fn f<T, Y>(s: T, u: Y) {} // ok! }

Type parameters in an associated item also cannot shadow parameters from the containing item:

#![allow(unused)] fn main() { trait Foo<T> { fn do_something(&self) -> T; fn do_something_else<T: Clone>(&self, bar: T); } }