E0628 - Error codes index
Description: Book listing all Rust error codes

# Error code E0628

More than one parameter was used for a generator.

Erroneous code example:

    #![feature(generators, generator_trait)]

    fn main() {
        let generator = |a: i32, b: i32| {
            // error: too many parameters for a generator
            // Allowed only 0 or 1 parameter
            yield a;
        };
    }

At present, it is not permitted to pass more than one explicit parameter for a generator.This can be fixed by using at most 1 parameter for the generator. For example, we might resolve the previous example by passing only one parameter.

    #![feature(generators, generator_trait)]

    fn main() {
        let generator = |a: i32| {
            yield a;
        };
    }