Cleanup: suppress warnings where appropriate.

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

@@ -529,6 +529,7 @@ fun filtering(): List<GenericFunction> {
         returns(Sequences) { "Sequence<T>" }
         body(Sequences) {
             """
+            @Suppress("UNCHECKED_CAST")
             return filterNot { it == null } as Sequence<T>
             """
         }

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

@@ -13,13 +13,14 @@ fun guards(): List<GenericFunction> {
         typeParam("T : Any")
         toNullableT = true
         returns("SELF")
-        body {
+        body { f ->
             """
             for (element in this) {
                 if (element == null) {
                     throw IllegalArgumentException("null element found in $THIS.")
                 }
             }
+            @Suppress("${if (f == InvariantArraysOfObjects) "CAST_NEVER_SUCCEEDS" else "UNCHECKED_CAST"}")
             return this as SELF
             """
         }

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

@@ -102,6 +102,7 @@ fun ordering(): List<GenericFunction> {
             """
                 if (this is Collection) {
                     if (size <= 1) return this.toMutableList()
+                    @Suppress("CAST_NEVER_SUCCEEDS")
                     return (toTypedArray<Comparable<T>>() as Array<T>).apply { sort() }.asList()
                 }
                 return toMutableList().apply { sort() }
@@ -231,6 +232,7 @@ fun ordering(): List<GenericFunction> {
             """
              if (this is Collection) {
                 if (size <= 1) return this.toMutableList()
+                @Suppress("CAST_NEVER_SUCCEEDS")
                 return (toTypedArray<Any?>() as Array<T>).apply { sortWith(comparator) }.asList()
             }
             return toMutableList().apply { sortWith(comparator) }

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

@@ -202,6 +202,7 @@ fun specialJVM(): List<GenericFunction> {
         exclude(ArraysOfPrimitives, Strings)
         body {
             """
+            @Suppress("UNCHECKED_CAST")
             for (element in this) if (klass.isInstance(element)) destination.add(element as R)
             return destination
             """
@@ -224,6 +225,7 @@ fun specialJVM(): List<GenericFunction> {
         returns(Sequences) { "Sequence<R>" }
         body(Sequences) {
             """
+            @Suppress("UNCHECKED_CAST")
             return filter { klass.isInstance(it) } as Sequence<R>
             """
         }
@@ -264,6 +266,7 @@ fun specialJVM(): List<GenericFunction> {
         receiverAsterisk(true)
         body(Sequences) {
             """
+            @Suppress("UNCHECKED_CAST")
             return filter { it is R } as Sequence<R>
             """
         }
@@ -307,6 +310,7 @@ fun specialJVM(): List<GenericFunction> {
             val result = arrayOfNulls<T>(size)
             for (index in indices)
                 result[index] = this[index]
+            @Suppress("CAST_NEVER_SUCCEEDS")
             return result as Array<T>
             """
         }