warning: this let-binding has unit value
   --> zerostash-files/src/tree.rs:375:13
    |
375 | /             _ = entries.upsert(
376 | |                 name.into(),
377 | |                 move || noderef,
378 | |                 |_, v| {
...   |
381 | |                 },
382 | |             );
    | |_____________^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
    = note: `#[warn(clippy::let_unit_value)]` on by default
help: omit the `let` binding
    |
375 ~             entries.upsert(
376 +                 name.into(),
377 +                 move || noderef,
378 +                 |_, v| {
379 +                     noderef = *v;
380 +                     update = true;
381 +                 },
382 ~             );;
    |