[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-ecj/NullLibrary1.java

@@ -0,0 +1,37 @@
+public @lombok.EqualsAndHashCode @lombok.ToString @lombok.AllArgsConstructor class NullLibrary1 {
+  @lombok.With String foo;
+  public @org.eclipse.jdt.annotation.NonNull @java.lang.SuppressWarnings("all") NullLibrary1 withFoo(final String foo) {
+    return ((this.foo == foo) ? this : new NullLibrary1(foo));
+  }
+  public @java.lang.Override @java.lang.SuppressWarnings("all") 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;
+  }
+  protected @java.lang.SuppressWarnings("all") boolean canEqual(final java.lang.@org.eclipse.jdt.annotation.Nullable Object other) {
+    return (other instanceof NullLibrary1);
+  }
+  public @java.lang.Override @java.lang.SuppressWarnings("all") 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;
+  }
+  public @java.lang.Override @java.lang.SuppressWarnings("all") java.lang.@org.eclipse.jdt.annotation.NonNull String toString() {
+    return (("NullLibrary1(foo=" + this.foo) + ")");
+  }
+  public @java.lang.SuppressWarnings("all") NullLibrary1(final String foo) {
+    super();
+    this.foo = foo;
+  }
+}