**`rusttype` compile error**

[SKTT1Ryze]

When I run cargo build in the sudoku path, error occurs:

error[E0311]: the parameter type `K` may not live long enough
   --> /home/hustccc/.cargo/registry/src/mirrors.tuna.tsinghua.edu.cn-df7c3c540f42cdbd/rusttype-0.2.3/src/support/bst/map.rs:81:19
    |
81  |             match node.force() {
    |                   ^^^^
    |
    = help: consider adding an explicit lifetime bound for `K`
note: the parameter type `K` must be valid for the anonymous lifetime #1 defined on the function body at 77:9...
   --> /home/hustccc/.cargo/registry/src/mirrors.tuna.tsinghua.edu.cn-df7c3c540f42cdbd/rusttype-0.2.3/src/support/bst/map.rs:77:9
    |
77  | /         fn clone_subtree<K: Clone, V: Clone>(
78  | |                 node: node::NodeRef<marker::Immut, K, V, marker::LeafOrInternal>)
79  | |                 -> BTreeMap<K, V> {
80  | |
...   |
136 | |             }
137 | |         }
    | |_________^
error: could not compile `rusttype`.

It looks like the crate rusttype-0.2.3 compiles error.
And the piston2d-graphics crate depends on it.
How can I solve this problem?
Thanks for your answer.

[SKTT1Ryze]

I find an solution:pr

[SKTT1Ryze]

The PR has been merged, close this issue.