In method java.util.regex.Pattern.caseInsensitiveRangeFor() are assignments to local objects called ch, but they are not used in the method.

    private static CharProperty caseInsensitiveRangeFor(final int lower,
final int upper) {
return new CharProperty() {
boolean isSatisfiedBy(int ch) {
return inRange(lower, ch, upper) ||
inRange(lower, (ch = Character.toUpperCase(ch)), upper) ||
inRange(lower, (ch = Character.toLowerCase(ch)), upper);}};
    }

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