[8.x] Revert "[8.x] Allow lazy collection to be instantiated from a generator"

src/Illuminate/Collections/LazyCollection.php

@@ -5,7 +5,6 @@
 use ArrayIterator;
 use Closure;
 use DateTimeInterface;
-use Generator;
 use Illuminate\Support\Traits\EnumeratesValues;
 use Illuminate\Support\Traits\Macroable;
 use IteratorAggregate;
@@ -30,7 +29,7 @@ class LazyCollection implements Enumerable
      */
     public function __construct($source = null)
     {
-        if ($source instanceof Closure || $source instanceof Generator || $source instanceof self) {
+        if ($source instanceof Closure || $source instanceof self) {
             $this->source = $source;
         } elseif (is_null($source)) {
             $this->source = static::empty();
@@ -1365,10 +1364,6 @@ public function count()
      */
     protected function makeIterator($source)
     {
-        if ($source instanceof Generator) {
-            return $source;
-        }
-
         if ($source instanceof IteratorAggregate) {
             return $source->getIterator();
         }

tests/Support/SupportLazyCollectionTest.php

@@ -69,31 +69,6 @@ public function testCanCreateCollectionFromClosure()
         ], $data->all());
     }
 
-    public function testCanCreateCollectionFromGenerator()
-    {
-        $iterable = function () {
-            yield 1;
-            yield 2;
-            yield 3;
-        };
-        $data = LazyCollection::make($iterable());
-
-        $this->assertSame([1, 2, 3], $data->all());
-
-        $iterable = function () {
-            yield 'a' => 1;
-            yield 'b' => 2;
-            yield 'c' => 3;
-        };
-        $data = LazyCollection::make($iterable());
-
-        $this->assertSame([
-            'a' => 1,
-            'b' => 2,
-            'c' => 3,
-        ], $data->all());
-    }
-
     public function testEager()
     {
         $source = [1, 2, 3, 4, 5];