code: def get_struct_type(self, name):
          
          p = ffi.lib.LLVMPY_GetNamedStructType(self, _encode_string(name))
          if not p:
              raise NameError(name)
          return TypeRef(p)
docs: Get a TypeRef pointing to a structure type named *name*.
          NameError is raised if the struct type isn't found.