[issue #2221] [issue #788] Lombok now adds nullity annotations.

Which 'flavour' is defined in lombok.config; applied to toString, equals, canEqual, and plural-form of `@Singular`.

test/transform/resource/after-delombok/NullLibrary1.java

@@ -0,0 +1,42 @@
+public class NullLibrary1 {
+	String foo;
+	@java.lang.Override
+	@java.lang.SuppressWarnings("all")
+	public boolean equals(final java.lang.@org.eclipse.jdt.annotation.Nullable Object o) {
+		if (o == this) return true;
+		if (!(o instanceof NullLibrary1)) return false;
+		final NullLibrary1 other = (NullLibrary1) o;
+		if (!other.canEqual((java.lang.Object) this)) return false;
+		final java.lang.Object this$foo = this.foo;
+		final java.lang.Object other$foo = other.foo;
+		if (this$foo == null ? other$foo != null : !this$foo.equals(other$foo)) return false;
+		return true;
+	}
+	@java.lang.SuppressWarnings("all")
+	protected boolean canEqual(final java.lang.@org.eclipse.jdt.annotation.Nullable Object other) {
+		return other instanceof NullLibrary1;
+	}
+	@java.lang.Override
+	@java.lang.SuppressWarnings("all")
+	public int hashCode() {
+		final int PRIME = 59;
+		int result = 1;
+		final java.lang.Object $foo = this.foo;
+		result = result * PRIME + ($foo == null ? 43 : $foo.hashCode());
+		return result;
+	}
+	@java.lang.Override
+	@java.lang.SuppressWarnings("all")
+	public java.lang.@org.eclipse.jdt.annotation.NonNull String toString() {
+		return "NullLibrary1(foo=" + this.foo + ")";
+	}
+	@java.lang.SuppressWarnings("all")
+	public NullLibrary1(final String foo) {
+		this.foo = foo;
+	}
+	@org.eclipse.jdt.annotation.NonNull
+	@java.lang.SuppressWarnings("all")
+	public NullLibrary1 withFoo(final String foo) {
+		return this.foo == foo ? this : new NullLibrary1(foo);
+	}
+}