Bug 23320 Incomplete classpath and circular classpath options should be surfaced
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/CompilerPreferencePage.java
!PREF_PB_ASSERT_AS_IDENTIFIER.equals(changedKey) &&
					!PREF_RESOURCE_FILTER.equals(changedKey) &&
					!PREF_PB_MAX_PER_UNIT.equals(changedKey)) {
				return;
			}
		} else {
			updateComplianceEnableState();
		}
		
		IStatus status= StatusUtil.getMostSevere(new IStatus[] { validateCompliance(), validateMaxNumberProblems(), validateResourceFilters() });
		updateStatus(status);
	}
	
	private IStatus validateCompliance() {
		StatusInfo status= new StatusInfo();
		if (checkValue(PREF_COMPLIANCE, VERSION_1_3)) {
			if (checkValue(PREF_SOURCE_COMPATIBILITY, VERSION_1_4)) {
				status.setError(JavaUIMessages.getString("CompilerPreferencePage.cpl13src14.error")); 
				return status;
			} else if (checkValue(PREF_CODEGEN_TARGET_PLATFORM, VERSION_1_4)) {
				status.setError(JavaUIMessages.getString("CompilerPreferencePage.cpl13trg14.error")); 
				return status;
			}
		}
		if (checkValue(PREF_SOURCE_COMPATIBILITY, VERSION_1_4)) {
			if (!checkValue(PREF_PB_ASSERT_AS_IDENTIFIER, ERROR)) {
				status.setError(JavaUIMessages.getString("CompilerPreferencePage.src14asrterr.error")); 
				return status;
			}
		}