Fixed issue 513: If equals is present but hashCode isn't, @Data now generates a warning to explain this strange situation.

test/transform/resource/before/EqualsAndHashCodeWithSomeExistingMethods.java

@@ -0,0 +1,47 @@
+import lombok.*;
+import static lombok.AccessLevel.NONE;
+
+@Data
+@Getter(NONE)
+@Setter(NONE)
+class EqualsAndHashCodeWithSomeExistingMethods {
+	int x;
+	
+	public int hashCode() {
+		return 42;
+	}
+}
+
+@Data
+@Getter(NONE)
+@Setter(NONE)
+class EqualsAndHashCodeWithSomeExistingMethods2 {
+	int x;
+	
+	public boolean canEqual(Object other) {
+		return false;
+	}
+}
+
+@Data
+@Getter(NONE)
+@Setter(NONE)
+class EqualsAndHashCodeWithAllExistingMethods {
+	int x;
+	
+	public int hashCode() {
+		return 42;
+	}
+	
+	public boolean equals(Object other) {
+		return false;
+	}
+}
+
+@Data
+@Getter(AccessLevel.NONE)
+@Setter(lombok.AccessLevel.NONE)
+class EqualsAndHashCodeWithNoExistingMethods {
+	int x;
+}
+