Cleaner (?) fix for crash in #2302

See  #2302 (comment)

Author: Guido van Rossum

mypy/checkexpr.py

@@ -1373,7 +1373,9 @@ def visit_reveal_type_expr(self, expr: RevealTypeExpr) -> Type:
 
     def visit_type_application(self, tapp: TypeApplication) -> Type:
         """Type check a type application (expr[type, ...])."""
-        tp = cast(CallableType, self.accept(tapp.expr))
+        tp = self.accept(tapp.expr)
+        if not isinstance(tp, CallableType):
+            return AnyType()
         return self.apply_generic_arguments(tp, tapp.types, tapp)
 
     def visit_type_alias_expr(self, alias: TypeAliasExpr) -> Type: