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When trying to run the examples, or build with the gpu_cache feature flag, like so:

cargo run --example gpu_cache --features=gpu_cache or cargo build --features=gpu_cache

it doesn't build, since there's a lot of unimplemented traits, for example:

error[E0277]: the trait bound `gpu_cache::Row: std::clone::Clone` is not satisfied                                                  
   --> /home/icefox/.cargo/registry/src/github.com-1ecc6299db9ec823/rusttype-0.7.3/src/gpu_cache.rs:209:5                           
    |                                                                                                                               
209 |     rows: LinkedHashMap<u32, Row, FxBuildHasher>,                                                                             
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::clone::Clone` is not implemented for `gpu_cache::Row`        
    |                                                                                                                               
    = note: required because of the requirements on the impl of `std::clone::Clone` for `gpu_cache::linked_hash_map::LinkedHashMap<u32, gpu_cache::Row, std::hash::BuildHasherDefault<gpu_cache::rustc_hash::FxHasher>>`
    = note: required by `std::clone::Clone::clone`