remove toMaybe as well

Author: akarnokd

src/main/java/io/reactivex/Observable.java

@@ -26,7 +26,6 @@
 import io.reactivex.internal.fuseable.ScalarCallable;
 import io.reactivex.internal.observers.*;
 import io.reactivex.internal.operators.flowable.FlowableFromObservable;
-import io.reactivex.internal.operators.maybe.MaybeFromObservable;
 import io.reactivex.internal.operators.observable.*;
 import io.reactivex.internal.util.*;
 import io.reactivex.observables.*;
@@ -11580,21 +11579,6 @@ public final Flowable<T> toFlowable(BackpressureStrategy strategy) {
         }
     }
 
-    /**
-     * Converts this Observable into a Maybe and expects this Observable to have at most one item
-     * or a completion signal; otherwise the resulting Maybe will signal an IndexOutOfBoundsException.
-     * <dl>
-     *  <dt><b>Scheduler:</b></dt>
-     *  <dd>{@code toMaybe} does not operate by default on a particular {@link Scheduler}.</dd>
-     * </dl>
-     * @return the new Maybe instance
-     * @since 2.0
-     */
-    @SchedulerSupport(SchedulerSupport.NONE)
-    public final Maybe<T> toMaybe() {
-        return new MaybeFromObservable<T>(this);
-    }
-
     /**
      * Returns a Single that emits a list that contains the items emitted by the source ObservableSource, in a
      * sorted order. Each item emitted by the ObservableSource must implement {@link Comparable} with respect to all

src/test/java/io/reactivex/maybe/MaybeTest.java

@@ -102,7 +102,7 @@ public void fromFlowableDisposeComposesThrough() {
     public void fromObservableEmpty() {
 
         Observable.empty()
-        .toMaybe()
+        .singleElement()
         .test()
         .assertResult();
     }
@@ -111,7 +111,7 @@ public void fromObservableEmpty() {
     public void fromObservableJust() {
 
         Observable.just(1)
-        .toMaybe()
+        .singleElement()
         .test()
         .assertResult(1);
     }
@@ -120,7 +120,7 @@ public void fromObservableJust() {
     public void fromObservableError() {
 
         Observable.error(new TestException())
-        .toMaybe()
+        .singleElement()
         .test()
         .assertFailure(TestException.class);
     }
@@ -137,7 +137,7 @@ public void fromObservableValueAndError() {
     public void fromObservableMany() {
 
         Observable.range(1, 2)
-        .toMaybe()
+        .singleElement()
         .test()
         .assertFailure(IndexOutOfBoundsException.class);
     }
@@ -146,7 +146,7 @@ public void fromObservableMany() {
     public void fromObservableDisposeComposesThrough() {
         PublishSubject<Integer> pp = PublishSubject.create();
 
-        TestObserver<Integer> ts = pp.toMaybe().test(false);
+        TestObserver<Integer> ts = pp.singleElement().test(false);
 
         assertTrue(pp.hasObservers());
 
@@ -159,7 +159,7 @@ public void fromObservableDisposeComposesThrough() {
     public void fromObservableDisposeComposesThroughImmediatelyCancelled() {
         PublishSubject<Integer> pp = PublishSubject.create();
 
-        pp.toMaybe().test(true);
+        pp.singleElement().test(true);
 
         assertFalse(pp.hasObservers());
     }
@@ -337,7 +337,7 @@ public void flowableMaybeFlowable() {
 
     @Test
     public void obervableMaybeobervable() {
-        Observable.just(1).toMaybe().toObservable().test().assertResult(1);
+        Observable.just(1).singleElement().toObservable().test().assertResult(1);
     }
 
     @Test