code: def _generate_gen_union_decl(self, tp, name):
      assert name == tp.name
      self._generate_struct_or_union_decl(tp, "union", name)
  
imports: import sys, os
  import types
  from .None import model
  from .error import VerificationError
label_desc: Use image node_id 19 for calling the VGenericEngine obj's underlying member method code with example usage: obj._generate_gen_union_decl(tp, name) without return types