Compiling playground v0.0.1 (/playground)
error[E0433]: failed to resolve: could not find `pool` in `heapless`
   --> src/main.rs:3:26
    |
3   | use heapless::{box_pool, pool::boxed::{Box, BoxBlock}};
    |                          ^^^^ could not find `pool` in `heapless`
    |
note: found an item that was configured out
   --> /playground/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/heapless-0.8.0/src/lib.rs:129:9
    |
129 | pub mod pool;
    |         ^^^^
note: the item is gated here
   --> /playground/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/heapless-0.8.0/src/lib.rs:128:1
    |
128 | #[cfg(any(arm_llsc, target_arch = "x86"))]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^