Adding variance to Try#toEither

Author: jnape

src/main/java/com/jnape/palatable/lambda/adt/Either.java

@@ -292,7 +292,7 @@ public static <L, R> Either<L, R> fromMaybe(Maybe<R> maybe, Supplier<L> leftFn)
     @SuppressWarnings("unchecked")
     public static <E extends Exception, L, R> Either<L, R> trying(CheckedSupplier<E, ? extends R> supplier,
                                                                   Function<? super E, ? extends L> leftFn) {
-        return Try.trying(supplier).toEither(leftFn).biMap(id(), id());
+        return Try.<E, R>trying(supplier::get).toEither(leftFn);
     }
 
     /**

src/main/java/com/jnape/palatable/lambda/adt/Try.java

@@ -125,7 +125,7 @@ public final Either<T, A> toEither() {
      * @param <L> the {@link Either} left parameter type
      * @return {@link Either} the success value or the mapped left value
      */
-    public final <L> Either<L, A> toEither(Function<? super T, L> fn) {
+    public final <L> Either<L, A> toEither(Function<? super T, ? extends L> fn) {
         return match(fn.andThen(Either::left), Either::right);
     }