PropertyExpression pe = (PropertyExpression) newValue;
            if (!(pe.getObjectExpression() instanceof ClassExpression)) {
                addError("unable to find class '" + pe.getText() + "' for annotation attribute constant", pe.getObjectExpression());
            }
        } else if (newValue instanceof ListExpression) {
            ListExpression le = (ListExpression) newValue;

        def verifFile = file("gradle/verification-keyring.${extension}")
        keyring.writePublicKeyRingTo(verifFile)
        if (header != null) {
            verifFile.setText("""$header
${verifFile.getText('us-ascii')}""", 'us-ascii')
        }

        given:
        javaLibrary()
        uncheckedModule("org", "foo", "1.0") {
            withSignature {
                keyring.sign(it)