// introducing copies just to clean them up again.
	if result[0] != '(' {
		// variable
		if top {
			// It in not safe in general to move a variable between blocks
			// (and particularly not a phi node).
			// Introduce a copy.
			rr.add(stmtf("v.copyOf(%s)", result))
		}
		return result
	}

	w := normalizeWhitespace(result)
	if prev := cse[w]; prev != "" {
		return prev
	}