xot v0.22.0 fails to compile on Rust 1.77.0

[kawadakk]

error[E0309]: the parameter type `V` may not live long enough
   --> /home/$USER/.cargo/registry/src/index.crates.io-6f17d22bba15001f/xot-0.22.0/src/nodemap/core.rs:100:9
    |
37  |   impl<'a, K, V, A: ValueAdapter<K, V>> NodeMap<'a, K, V, A>
    |        -- the parameter type `V` must be valid for the lifetime `'a` as defined here...
...
100 | /         self.iter_value()
101 | |             .map(|value| (A::key(value), A::value(value)))
    | |__________________________________________________________^ ...so that the type `V` will meet its required lifetime bounds
    |
help: consider adding an explicit lifetime bound
    |
40  |     V: Clone + 'a,
    |              ++++

error[E0309]: the parameter type `V` may not live long enough
   --> /home/$USER/.cargo/registry/src/index.crates.io-6f17d22bba15001f/xot-0.22.0/src/nodemap/core.rs:116:9
    |
37  | impl<'a, K, V, A: ValueAdapter<K, V>> NodeMap<'a, K, V, A>
    |      -- the parameter type `V` must be valid for the lifetime `'a` as defined here...
...
116 |         self.iter_value().map(move |value| A::value(value))
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ...so that the type `V` will meet its required lifetime bounds
    |
help: consider adding an explicit lifetime bound
    |
40  |     V: Clone + 'a,
    |              ++++

For more information about this error, try `rustc --explain E0309`.
error: could not compile `xot` (lib) due to 2 previous errors

xot/src/nodemap/core.rs

Lines 99 to 102 in 6fbd052

	pub fn iter(&self) -> impl Iterator<Item = (K, &'a V)> + '_ {
	self.iter_value()
	.map(|value| (A::key(value), A::value(value)))
	}

xot/src/nodemap/core.rs

Lines 115 to 117 in 6fbd052

	pub fn values(&self) -> impl Iterator<Item = &'a V> + '_ {
	self.iter_value().map(move |value| A::value(value))
	}

[kawadakk]

This probably has been caused by rust-lang/rust#120019 (a soundness fix).

&'a V in -> impl Iterator<Item = &'a V> doesn't create implied lifetime bounds or have its WF-ness checked (rust-lang/rust#110925). Since &'a V appears in the function body and the concrete return type anyway, V: 'a has to be verified to prove its WF-ness, which didn't happen until rust-lang/rust#120019.

MutableNodeMap::{iter,values} don't need V: 'a because the parameters &'a self (self: &'a MutableNodeMap<'a, K, V, A>) already imply V: 'a.

[faassen]

Thanks! I've followed the suggestion and added a 'a and after that it compiles again. I've made a new release, 0.23, which also has various changes and new features concerning serialization I still had to release.