Hi everyone,

I am trying to write a method that returns an iterator, and I am hitting a compiler error that I don’t fully understand.

Here is a simplified version of the code:

use std::iter::once;

struct MyStruct;

impl MyStruct {
    pub fn method<'s, 'a>(
            &'s self,
            a: impl Iterator<Item = &'a u128>,
        ) -> impl Iterator<Item = u128> + use<> {
           once(0)
    }
}

The compiler complains with this note:

note: currently, all type parameters are required to be mentioned in the precise captures list

But I don’t want to capture anything, that’s the whole point for using use<> in this case.

Rust playground link.

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