Allow using kotlin.Result as a return type in stdlib

libraries/stdlib/common/build.gradle

@@ -59,7 +59,8 @@ compileKotlinCommon {
                 "-Xuse-experimental=kotlin.contracts.ExperimentalContracts",
                 "-XXLanguage:+InlineClasses",
                 "-XXLanguage:+ReleaseCoroutines",
-                "-Xallow-kotlin-package"
+                "-Xallow-kotlin-package",
+                "-Xallow-result-return-type"
         ]
     }
 }
@@ -72,7 +73,8 @@ compileCoroutinesKotlinCommon {
                 "-module-name", project.name+"-coroutines",
                 "-Xuse-experimental=kotlin.contracts.ExperimentalContracts",
                 "-XXLanguage:-ReleaseCoroutines",
-                "-Xallow-kotlin-package"
+                "-Xallow-kotlin-package",
+                "-Xallow-result-return-type"
         ]
     }
 }

libraries/stdlib/js/build.gradle

@@ -128,6 +128,7 @@ tasks.withType(org.jetbrains.kotlin.gradle.tasks.Kotlin2JsCompile) {
         freeCompilerArgs = [
                 "-version",
                 "-Xallow-kotlin-package",
+                "-Xallow-result-return-type"
         ]
     }
 }

libraries/stdlib/jvm/build.gradle

@@ -178,6 +178,7 @@ compileKotlin {
         freeCompilerArgs = [
                 "-version",
                 "-Xallow-kotlin-package",
+                "-Xallow-result-return-type",
                 "-Xmultifile-parts-inherit",
                 "-Xnormalize-constructor-calls=enable",
                 "-module-name", "kotlin-stdlib",
@@ -213,6 +214,7 @@ compileCoroutinesKotlin {
         freeCompilerArgs = [
                 "-version",
                 "-Xallow-kotlin-package",
+                "-Xallow-result-return-type",
                 "-Xmultifile-parts-inherit",
                 "-Xuse-experimental=kotlin.contracts.ExperimentalContracts",
                 "-XXLanguage:-ReleaseCoroutines",