{"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"///"}]}
    /// Trait<Item = &u32>` expands to an opaque type like `type
    /// don't have to create a parameter for them. That is, `impl
    /// Foo<'a> = impl Trait<Item = &'a u32>`, but `impl Trait<item =