Deprecation of CopyCorners

ndsl/dsl/stencil_config.py

@@ -168,7 +168,7 @@ def from_dict(cls, data: dict):
 class StencilConfig(Hashable):
     compare_to_numpy: bool = False
     compilation_config: CompilationConfig = CompilationConfig()
-    dace_config: Optional[DaceConfig] = None
+    dace_config: DaceConfig = None
     verbose: bool = False
 
     def __post_init__(self):

ndsl/stencils/corners.py

@@ -1,16 +1,18 @@
+import warnings
 from typing import Optional, Sequence, Tuple
 
 from gt4py.cartesian import gtscript
 from gt4py.cartesian.gtscript import PARALLEL, computation, horizontal, interval, region
 
+from ndsl import StencilFactory
 from ndsl.constants import (
     X_DIM,
     X_INTERFACE_DIM,
     Y_DIM,
     Y_INTERFACE_DIM,
     Z_INTERFACE_DIM,
 )
-from ndsl.dsl.stencil import GridIndexing, StencilFactory
+from ndsl.dsl.stencil import GridIndexing
 from ndsl.dsl.typing import FloatField
 
 
@@ -22,6 +24,13 @@ class CopyCorners:
 
     def __init__(self, direction: str, stencil_factory: StencilFactory) -> None:
         """The grid for this stencil"""
+        warnings.warn(
+            "Usage of the GT4Py implementation of CopyCorners is discouraged and will"
+            "be removed in the next release. Use `CopyCornersX` or `CopyCornersY` in PyFV3"
+            "for a more future-proof implementation of the same code.",
+            DeprecationWarning,
+            2,
+        )
         grid_indexing = stencil_factory.grid_indexing
 
         n_halo = grid_indexing.n_halo