Fix TypeError in is_literal_or_name on unhashable set literals (#339)

ast.literal_eval raises TypeError (not just SyntaxError/ValueError)
when evaluating set literals containing unhashable types like dicts
or lists. Catch TypeError as well to prevent the crash.

Fixes #325

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: Fridayai700

autoflake.py

@@ -787,7 +787,7 @@ def is_literal_or_name(value: str) -> bool:
     try:
         ast.literal_eval(value)
         return True
-    except (SyntaxError, ValueError):
+    except (SyntaxError, TypeError, ValueError):
         pass
 
     if value.strip() in ["dict()", "list()", "set()"]:

test_autoflake.py

@@ -1860,6 +1860,11 @@ def test_is_literal_or_name(self) -> None:
         self.assertFalse(autoflake.is_literal_or_name("xyz.prop"))
         self.assertFalse(autoflake.is_literal_or_name(" "))
 
+    def test_is_literal_or_name_with_unhashable_types(self) -> None:
+        """Should not crash on set literals containing unhashable types."""
+        self.assertFalse(autoflake.is_literal_or_name("{{}}"))
+        self.assertFalse(autoflake.is_literal_or_name("{[]}"))
+
     def test_is_python_file(self) -> None:
         self.assertTrue(
             autoflake.is_python_file(