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_kind: &RhsAssignKind<'_>,
    rhs_tactics: RhsTactics,
    between_span: Span,
    allow_extend: bool
) -> Option<String>