Rustfmt generates invalid code for associated type bounds with where-clause and comments #6761

pub trait Trait {
    type I: Iterator<
        // This is an item
        Item = Self,
    >
    where
        Self: Copy;
}

pub trait Trait {
    type I: Iterator<
        // This is an item
        Item = Self,
    >
    : Iterator<
    // This is an item
    Item = Self,
    >
    where
        Self: Copy;
}