Bug 73337 New compiler option (COMPILER_PB_ENUM_IDENTIFIER) needs UI
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/CompilerConfigurationBlock.java
/* (non-javadoc)
	 * Update fields and validate.
	 * @param changedKey Key that changed, or null, if all changed.
	 */	
	protected void validateSettings(String changedKey, String newValue) {
		
		if (changedKey != null) {
			if (INTR_DEFAULT_COMPLIANCE.equals(changedKey)) {
				updateComplianceEnableState();
				updateComplianceDefaultSettings(true);
				fComplianceStatus= validateCompliance();
			} else if (PREF_COMPLIANCE.equals(changedKey)) {
				if (checkValue(INTR_DEFAULT_COMPLIANCE, DEFAULT_CONF)) {
					updateComplianceDefaultSettings(false);
				}
				fComplianceStatus= validateCompliance();
			} else if (PREF_SOURCE_COMPATIBILITY.equals(changedKey)) {
				updateAssertAsIdentifierEnableState();
				fComplianceStatus= validateCompliance();
			} else if (PREF_CODEGEN_TARGET_PLATFORM.equals(changedKey) ||
					PREF_PB_ASSERT_AS_IDENTIFIER.equals(changedKey)) {
				fComplianceStatus= validateCompliance();
				updateInlineJSREnableState();
			} else if (PREF_PB_MAX_PER_UNIT.equals(changedKey)) {
				fMaxNumberProblemsStatus= validateMaxNumberProblems();
			} else if (PREF_RESOURCE_FILTER.equals(changedKey)) {