var can now also be configured to emit a warning when used.

test/transform/resource/before/VarWarning.java

@@ -0,0 +1,10 @@
+//CONF: lombok.var.flagUsage = WARNING
+//skip compare contents
+import lombok.experimental.var;
+
+public class VarWarning {
+	public void isOkay() {
+		var x = "Warning";
+		x.toLowerCase();
+	}
+}