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I am getting this error:

error[E0432]: unresolved imports `core::alloc::Alloc`, `core::alloc::AllocErr`, `core::alloc::CannotReallocInPlace`
  --> /home/pitust/.cargo/git/checkouts/ralloc-86e49427d195b033/e87746c/src/lib.rs:46:19
   |
46 | use core::alloc::{Alloc, AllocErr, CannotReallocInPlace, Layout};
   |                   ^^^^^  ^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^ no `CannotReallocInPlace` in `alloc`
   |                   |      |
   |                   |      no `AllocErr` in `alloc`
   |                   |      help: a similar name exists in the module: `AllocError`
   |                   no `Alloc` in `alloc`

Is this a bug?