Function rustfmt_nightly::expr::rewrite_assign_rhs_with_comments

pub(crate) fn rewrite_assign_rhs_with_comments<S: Into<String>, R: Rewrite>(
    context: &RewriteContext<'_>, 
    lhs: S, 
    ex: &R, 
    shape: Shape, 
    rhs_tactics: RhsTactics, 
    between_span: Span, 
    allow_extend: bool
) -> Option<String>