Fixes

Author: rhshadrach

pandas/core/common.py

@@ -652,7 +652,7 @@ def fill_missing_names(names: Sequence[Hashable | None]) -> list[Hashable]:
     return [f"level_{i}" if name is None else name for i, name in enumerate(names)]
 
 
-def _depr_core():
+def _depr_core() -> None:
     warnings.warn(
         "pandas.core is deprecated and has been renamed to "
         "pandas._core. Accessing `_core` directly is discouraged as "

scripts/validate_unwanted_patterns.py

@@ -53,6 +53,8 @@
     "_version_meson",
     # TODO(3.0): GH#55043 - remove upon removal of ArrayManager
     "_get_option",
+    # GH#27522
+    "_depr_core",
 }