Missing must_use tags

[jonjove]

I got several errors like

error: this method could have a `#[must_use]` attribute
    --> src/curr.rs:7865:5
     |
7865 |     pub fn iter(&self) -> Iter<'_, PeerStats> {
     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: add the attribute: `#[must_use] pub fn iter(&self) -> Iter<'_, PeerStats>`
     |
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#must_use_candidate

when generating from the XDR fields. The error always occurs on pub fn iter.

[leighmcculloch]

@jonjove Are you on latest stable of rust? 1.61.0. there just happens to have been a change to the iter() function in 1.61 that trips this up on older versions.

[jonjove]

I encountered this on 1.59.0. Doesn't seem to happen on 1.61.0.