fixes

Author: topper-123

pandas/core/dtypes/common.py

@@ -1732,7 +1732,7 @@ def _validate_date_like_dtype(dtype) -> None:
         )
 
 
-def validate_all_hashable(*args) -> None:
+def validate_all_hashable(*args, name: str=None) -> None:
     """
     Return None if all args are hashable, else raise a TypeError.
 
@@ -1752,7 +1752,10 @@ def validate_all_hashable(*args) -> None:
     TypeError: All elements must be hashable
     """
     if not all(is_hashable(arg) for arg in args):
-        raise TypeError("All elements must be hashable")
+        if name:
+            raise TypeError(f"{name} must be a hashable type")
+        else:
+            raise TypeError("All elements must be hashable")
 
 
 def pandas_dtype(dtype) -> DtypeObj:

pandas/core/indexes/base.py

@@ -1211,7 +1211,7 @@ def _validate_names(self, name=None, names=None, deep: bool = False) -> List[Lab
             )
 
         # All items in 'new_names' need to be hashable
-        validate_all_hashable(*new_names)
+        validate_all_hashable(*new_names, name=f"{type(self).__name__}.name")
 
         return new_names
 
@@ -1241,7 +1241,7 @@ def _set_names(self, values, level=None):
 
         # GH 20527
         # All items in 'name' need to be hashable:
-        validate_all_hashable(*values)
+        validate_all_hashable(*values, name=f"{type(self).__name__}.name")
 
         self._name = values[0]
 

pandas/tests/indexes/multi/test_names.py

@@ -79,7 +79,7 @@ def test_copy_names():
     with pytest.raises(ValueError, match="Length of new names must be 2, got 1"):
         multi_idx.copy(names=["mario"])
 
-    with pytest.raises(TypeError, match="All elements must be hashable"):
+    with pytest.raises(TypeError, match="MultiIndex.name must be a hashable type"):
         multi_idx.copy(names=[["mario"], ["luigi"]])