Fix crash when a slice object is called

doc/whatsnew/fragments/10708.bugfix

@@ -0,0 +1,4 @@
+Fix crash for ``prefer-typing-namedtuple`` and ``consider-math-not-float`` when
+a ``slice`` object is called.
+
+Closes #10708

pylint/extensions/code_style.py

@@ -113,7 +113,7 @@ def open(self) -> None:
     def visit_call(self, node: nodes.Call) -> None:
         if self._py36_plus:
             called = safe_infer(node.func)
-            if not called:
+            if not (called and isinstance(called, (nodes.FunctionDef, nodes.ClassDef))):
                 return
             if called.qname() == "collections.namedtuple":
                 self.add_message(

tests/functional/ext/code_style/cs_prefer_typing_namedtuple.py

@@ -7,3 +7,8 @@ class SearchMatch(
     namedtuple('SearchMatch', ['els', 'index', 'iterator'])  # [prefer-typing-namedtuple]
 ):
     """Adapted from primer package `music21`."""
+
+
+# Regression test for https://github.com/pylint-dev/pylint/issues/10708
+x = slice(42)
+x()  # pylint: disable=not-callable