Function trait_namespace_env_var 

pub(super) fn trait_namespace_env_var(
    type_ident: &Ident,
    trait_name: &Ident,
) -> String

The local environment variable S7 trait wrappers assign members into before attaching it to the class object via attr(). One owner so trait_namespace_target’s S7 arm and the generator’s new.env / attr() lines can’t drift apart.