Build: remove explicit enabling of RangeUntilOperator

This feature is enabled by default since 1.8. Using the `-XXLanguage`
compiler argument leads to big warnings which are distracting during the
build.

kotlin-native/runtime/build.gradle.kts

@@ -546,7 +546,6 @@ konanArtifacts {
                 "-opt-in=kotlin.contracts.ExperimentalContracts",
                 "-opt-in=kotlin.ExperimentalMultiplatform",
                 "-opt-in=kotlin.native.internal.InternalForKotlinNative",
-                "-XXLanguage:+RangeUntilOperator",
         )
 
         commonStdlibSrcDirs.forEach { commonSrcDir(it) }

libraries/stdlib/common/build.gradle

@@ -47,7 +47,6 @@ compileKotlinCommon {
                 "-opt-in=kotlin.ExperimentalMultiplatform",
                 "-opt-in=kotlin.contracts.ExperimentalContracts",
                 "-Xallow-kotlin-package",
-                "-XXLanguage:+RangeUntilOperator",
         ]
     }
 }
@@ -59,7 +58,6 @@ compileTestKotlinCommon {
                 "-opt-in=kotlin.ExperimentalUnsignedTypes",
                 "-opt-in=kotlin.ExperimentalStdlibApi",
                 "-opt-in=kotlin.io.encoding.ExperimentalEncodingApi",
-                "-XXLanguage:+RangeUntilOperator",
         ]
     }
 }

libraries/stdlib/js-ir-minimal-for-test/build.gradle.kts

@@ -143,7 +143,6 @@ tasks.withType<KotlinCompile<*>> {
         "-opt-in=kotlin.RequiresOptIn",
         "-opt-in=kotlin.ExperimentalUnsignedTypes",
         "-opt-in=kotlin.ExperimentalStdlibApi",
-        "-XXLanguage:+RangeUntilOperator",
     )
 }
 

libraries/stdlib/js-ir/build.gradle.kts

@@ -146,7 +146,6 @@ tasks.withType<KotlinCompile<*>>().configureEach {
         "-opt-in=kotlin.ExperimentalUnsignedTypes",
         "-opt-in=kotlin.ExperimentalStdlibApi",
         "-opt-in=kotlin.io.encoding.ExperimentalEncodingApi",
-        "-XXLanguage:+RangeUntilOperator",
     )
 }
 

libraries/stdlib/js-v1/build.gradle

@@ -134,7 +134,6 @@ compileKotlin2Js {
             "-opt-in=kotlin.RequiresOptIn",
             "-opt-in=kotlin.ExperimentalMultiplatform",
             "-opt-in=kotlin.contracts.ExperimentalContracts",
-            "-XXLanguage:+RangeUntilOperator",
             "-Xforce-deprecated-legacy-compiler-usage"
         ]
     }
@@ -148,7 +147,6 @@ compileTestKotlin2Js {
             "-opt-in=kotlin.ExperimentalUnsignedTypes",
             "-opt-in=kotlin.ExperimentalStdlibApi",
             "-opt-in=kotlin.io.encoding.ExperimentalEncodingApi",
-            "-XXLanguage:+RangeUntilOperator",
         ]
     }
 }

libraries/stdlib/jvm/build.gradle

@@ -152,7 +152,6 @@ compileKotlin {
                 "-opt-in=kotlin.contracts.ExperimentalContracts",
                 "-Xuse-14-inline-classes-mangling-scheme",
                 "-Xbuiltins-from-sources",
-                "-XXLanguage:+RangeUntilOperator",
                 "-Xno-new-java-annotation-targets",
         ]
         moduleName = "kotlin-stdlib"
@@ -197,7 +196,6 @@ compileTestKotlin {
                 "-opt-in=kotlin.ExperimentalStdlibApi",
                 "-opt-in=kotlin.io.path.ExperimentalPathApi",
                 "-opt-in=kotlin.io.encoding.ExperimentalEncodingApi",
-                "-XXLanguage:+RangeUntilOperator",
                 "-Xallow-kotlin-package", // TODO: maybe rename test packages
         ]
         if (project.kotlinBuildProperties.useFir) {

libraries/stdlib/wasm/build.gradle.kts

@@ -130,7 +130,6 @@ tasks.withType<KotlinCompile<*>>().configureEach {
         "-opt-in=kotlin.ExperimentalUnsignedTypes",
         "-opt-in=kotlin.ExperimentalStdlibApi",
         "-opt-in=kotlin.io.encoding.ExperimentalEncodingApi",
-        "-XXLanguage:+RangeUntilOperator",
     )
 }