Function rustfmt_nightly::expr::rewrite_assign_rhs_with

pub(crate) fn rewrite_assign_rhs_with<S: Into<String>, R: Rewrite>(
    context: &RewriteContext<'_>,
    lhs: S,
    ex: &R,
    shape: Shape,
    rhs_kind: &RhsAssignKind<'_>,
    rhs_tactics: RhsTactics
) -> Option<String>