fix compiler crash when manager.__enter__() call node in with statement gets replaced

Cython/Compiler/ExprNodes.py

@@ -11312,11 +11312,14 @@ class ProxyNode(CoercionNode):
         self.constant_result = arg.constant_result
         self._proxy_type()
 
-    def analyse_expressions(self, env):
+    def analyse_types(self, env):
         self.arg = self.arg.analyse_expressions(env)
         self._proxy_type()
         return self
 
+    def infer_type(self, env):
+        return self.arg.infer_type(env)
+
     def _proxy_type(self):
         if hasattr(self.arg, 'type'):
             self.type = self.arg.type

Cython/Compiler/ParseTreeTransforms.py

@@ -1220,13 +1220,13 @@ class WithTransform(CythonTransform, SkipDeclarations):
         self.visitchildren(node, 'body')
         pos = node.pos
         body, target, manager = node.body, node.target, node.manager
-        node.enter_call = ExprNodes.SimpleCallNode(
+        node.enter_call = ExprNodes.ProxyNode(ExprNodes.SimpleCallNode(
             pos, function=ExprNodes.AttributeNode(
                 pos, obj=ExprNodes.CloneNode(manager),
                 attribute=EncodedString('__enter__'),
                 is_special_lookup=True),
             args=[],
-            is_temp=True)
+            is_temp=True))
         if target is not None:
             body = Nodes.StatListNode(
                 pos, stats = [