[fix] AttributeError crash when a slice is used as a class decorator

doc/whatsnew/fragments/10334.bugfix

@@ -0,0 +1,3 @@
+Using a slice as a class decorator now raise a 'not-callable' message instead of crashing pylint.
+
+Closes #10334

pylint/checkers/deprecated.py

@@ -136,7 +136,7 @@ def visit_decorators(self, node: nodes.Decorators) -> None:
             inferred = safe_infer(children[0].func)
         else:
             inferred = safe_infer(children[0])
-        if not inferred:
+        if not inferred or not hasattr(inferred, "qname"):
             return
         qname = inferred.qname()
         if qname in self.deprecated_decorators():

pylint/checkers/utils.py

@@ -873,7 +873,8 @@ def decorated_with(
             decorator_node = decorator_node.func
         try:
             if any(
-                i.name in qnames or i.qname() in qnames
+                (hasattr(i, "name") and i.name in qnames)
+                or (hasattr(i, "qname") and i.qname() in qnames)
                 for i in decorator_node.infer()
                 if i is not None and not isinstance(i, util.UninferableBase)
             ):

tests/functional/r/regression_02/regression_10334.py

@@ -0,0 +1,6 @@
+"""Test for slice object used as a decorator."""
+# pylint: disable=too-few-public-methods
+s = slice(-2)
+@s()  # [not-callable]
+class A:
+    """Class with a slice decorator."""

tests/functional/r/regression_02/regression_10334.txt

@@ -0,0 +1 @@
+not-callable:4:1:4:4:A:s is not callable:UNDEFINED