code: synchronized List<AstPrimitive> getAllPrims() {
      List<AstPrimitive> prims = new ArrayList<>();
      for (AstPrimitive prim : _loader) {
        prims.add(prim);
      }
      return prims;
    }
docs: Locates all available non-core primitives of the Rapid language.
  @return list of Rapid primitives