error[E0425]: cannot find value `range` in this scope
   --> src/disktree/tree.rs:132:53
    |
132 |                 let val_bytes = &(*self.0).as_ref()[range];
    |                                                     ^^^^^ not found in this scope
    |
help: consider importing one of these items
    |
1   + use core::slice::range;
    |
1   + use std::slice::range;
    |