fix a compiler crash when casting to a memoryview

Cython/Compiler/ExprNodes.py

@@ -10130,7 +10130,9 @@ class CythonArrayNode(ExprNode):
         return self.get_cython_array_type(env)
 
     def get_cython_array_type(self, env):
-        return env.global_scope().context.cython_scope.viewscope.lookup("array").type
+        cython_scope = env.global_scope().context.cython_scope
+        cython_scope.load_cythonscope()
+        return cython_scope.viewscope.lookup("array").type
 
     def generate_result_code(self, code):
         from . import Buffer