code: def nonfatal_error(self, error):
      # We're passing self as context to transform to trap this
      self.error = error
      self.assertTrue(self.expect_error)
  
imports: from Cython.TestUtils import CythonTest
  import Cython.Compiler.Errors
  from Cython.Compiler.Nodes import *
  from Cython.Compiler.ParseTreeTransforms import *
  from Cython.Compiler.Buffer import *
label_desc: Use image node_id 1 for calling the TestBufferOptions obj's underlying member method code with example usage: obj.nonfatal_error(error) without return types