Add sample for filterNotNull

libraries/stdlib/common/src/generated/_Arrays.kt

@@ -3920,6 +3920,8 @@ public inline fun CharArray.filterNot(predicate: (Char) -> Boolean): List<Char>
 
 /**
  * Returns a list containing all elements that are not `null`.
+ * 
+ * @sample samples.collections.Collections.Filtering.filterNotNull
  */
 public fun <T : Any> Array<out T?>.filterNotNull(): List<T> {
     return filterNotNullTo(ArrayList<T>())

libraries/stdlib/common/src/generated/_Collections.kt

@@ -749,6 +749,8 @@ public inline fun <T> Iterable<T>.filterNot(predicate: (T) -> Boolean): List<T>
 
 /**
  * Returns a list containing all elements that are not `null`.
+ * 
+ * @sample samples.collections.Collections.Filtering.filterNotNull
  */
 public fun <T : Any> Iterable<T?>.filterNotNull(): List<T> {
     return filterNotNullTo(ArrayList<T>())

libraries/stdlib/common/src/generated/_Sequences.kt

@@ -439,6 +439,8 @@ public fun <T> Sequence<T>.filterNot(predicate: (T) -> Boolean): Sequence<T> {
  * Returns a sequence containing all elements that are not `null`.
  *
  * The operation is _intermediate_ and _stateless_.
+ * 
+ * @sample samples.collections.Collections.Filtering.filterNotNull
  */
 public fun <T : Any> Sequence<T?>.filterNotNull(): Sequence<T> {
     @Suppress("UNCHECKED_CAST")

libraries/stdlib/samples/test/samples/collections/collections.kt

@@ -801,4 +801,14 @@ class Collections {
         }
 
     }
+
+    class Filtering {
+        @Sample
+        fun filterNotNull() {
+            val numbers: List<Int?> = listOf(1, 2, null, 4)
+            val nonNullNumbers = numbers.filterNotNull()
+
+            assertPrints(nonNullNumbers, "[1, 2, 4]")
+        }
+    }
 }

libraries/tools/kotlin-stdlib-gen/src/templates/Filtering.kt

@@ -730,6 +730,7 @@ object Filtering : TemplateGroupBase() {
         include(Iterables, Sequences, ArraysOfObjects)
     } builder {
         doc { "Returns a list containing all elements that are not `null`." }
+        sample("samples.collections.Collections.Filtering.filterNotNull")
         typeParam("T : Any")
         returns("List<T>")
         toNullableT = true