Function rustfmt_nightly::expr::choose_rhs

fn choose_rhs<R: Rewrite>(
    context: &RewriteContext<'_>, 
    expr: &R, 
    shape: Shape, 
    orig_rhs: Option<String>, 
    rhs_tactics: RhsTactics, 
    has_rhs_comment: bool
) -> Option<String>