Error code E0109

You tried to provide a generic argument to a type which doesn't need it.

Erroneous code example:

#![allow(unused)]
fn main() {
type X = u32<i32>; // error: type arguments are not allowed for this type
type Y = bool<'static>; // error: lifetime parameters are not allowed on
                        //        this type
}

Check that you used the correct argument and that the definition is correct.

Example:

#![allow(unused)]
fn main() {
type X = u32; // ok!
type Y = bool; // ok!
}

Note that generic arguments for enum variant constructors go after the variant, not after the enum. For example, you would write Option::None::<u32>, rather than Option::<u32>::None.