declare `MaybeAsyncCompile.__call__()` as a method

IPython/core/inputtransformer2.py

@@ -782,7 +782,8 b' class MaybeAsyncCompile(Compile):'
         super().__init__()
         self.flags |= extra_flags
 
-    __call__ = compile
+    def __call__(self, *args, **kwds):
+        return compile(*args, **kwds)
 
 
 class MaybeAsyncCommandCompiler(CommandCompiler):