REF: remove special-casing for IntervalDtype in Index._raise_if_missing (#54557)

Author: jbrockmendel

pandas/core/indexes/base.py

@@ -6165,19 +6165,7 @@ def _raise_if_missing(self, key, indexer, axis_name: str_t) -> None:
         nmissing = missing_mask.sum()
 
         if nmissing:
-            # TODO: remove special-case; this is just to keep exception
-            #  message tests from raising while debugging
-            use_interval_msg = isinstance(self.dtype, IntervalDtype) or (
-                isinstance(self.dtype, CategoricalDtype)
-                # "Index" has no attribute "categories"  [attr-defined]
-                and isinstance(
-                    self.categories.dtype, IntervalDtype  # type: ignore[attr-defined]
-                )
-            )
-
             if nmissing == len(indexer):
-                if use_interval_msg:
-                    key = list(key)
                 raise KeyError(f"None of [{key}] are in the [{axis_name}]")
 
             not_found = list(ensure_index(key)[missing_mask.nonzero()[0]].unique())

pandas/tests/indexing/interval/test_interval.py

@@ -106,7 +106,11 @@ def test_loc_getitem_frame(self):
         expected = df.take([4, 5, 4, 5])
         tm.assert_frame_equal(result, expected)
 
-        with pytest.raises(KeyError, match=r"None of \[\[10\]\] are"):
+        msg = (
+            r"None of \[Index\(\[10\], dtype='object', name='B'\)\] "
+            r"are in the \[index\]"
+        )
+        with pytest.raises(KeyError, match=msg):
             df.loc[[10]]
 
         # partial missing

pandas/tests/indexing/interval/test_interval_new.py

@@ -149,7 +149,10 @@ def test_loc_with_overlap(self, indexer_sl):
         with pytest.raises(KeyError, match=re.escape("Interval(3, 5, closed='right')")):
             indexer_sl(ser)[Interval(3, 5)]
 
-        msg = r"None of \[\[Interval\(3, 5, closed='right'\)\]\]"
+        msg = (
+            r"None of \[IntervalIndex\(\[\(3, 5\]\], "
+            r"dtype='interval\[int64, right\]'\)\] are in the \[index\]"
+        )
         with pytest.raises(KeyError, match=msg):
             indexer_sl(ser)[[Interval(3, 5)]]