diff --git a/arraycontext/impl/__init__.py b/arraycontext/impl/__init__.py
index 093caeee3247d5d8e93fe1df3854de869718865e..828e834db19623dc9833d99a2aaa824ea6427f55 100644
--- a/arraycontext/impl/__init__.py
+++ b/arraycontext/impl/__init__.py
@@ -25,40 +25,3 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 """
-
-from typing import Any
-
-
-def _is_meshmode_dofarray(x: Any) -> bool:
-    try:
-        from meshmode.dof_array import DOFArray
-    except ImportError:
-        return False
-    else:
-        return isinstance(x, DOFArray)
-
-
-def _is_pyopencl_array(x: Any) -> bool:
-    try:
-        import pyopencl.array as cla
-    except ImportError:
-        return False
-    else:
-        return isinstance(x, cla.Array)
-
-
-def _flatten_cl_array(ary):
-    import pyopencl.array as cl
-    assert isinstance(ary, cl.Array)
-
-    if ary.size == 0:
-        # Work around https://github.com/inducer/pyopencl/pull/402
-        return ary._new_with_changes(
-                data=None, offset=0, shape=(0,), strides=(ary.dtype.itemsize,))
-    if ary.flags.f_contiguous:
-        return ary.reshape(-1, order="F")
-    elif ary.flags.c_contiguous:
-        return ary.reshape(-1, order="C")
-    else:
-        raise ValueError("cannot flatten array "
-                f"with strides {ary.strides} of {ary.dtype}")