'From the given *envptr* (a pointer to a _dynfunc.Environment object),
get a EnvBody allowing structured access to environment fields.'

def get_env_body(self, builder, envptr):

    body_ptr = cgutils.pointer_add(builder, envptr, _dynfunc._impl_info['offsetof_env_body'])
    return EnvBody(self, builder, ref=body_ptr, cast_ref=True)
