diff --git a/kotlin-native/backend.native/tests/stdlib_external/utils.kt b/kotlin-native/backend.native/tests/stdlib_external/utils.kt
index 8ca0f9b13ef..b4ca95d825d 100644
--- a/kotlin-native/backend.native/tests/stdlib_external/utils.kt
+++ b/kotlin-native/backend.native/tests/stdlib_external/utils.kt
@@ -16,20 +16,12 @@ public actual fun assertTypeEquals(expected: Any?, actual: Any?) {
     }
 }
 
-internal actual fun String.removeLeadingPlusOnJava6(): String = this
-
-internal actual inline fun testOnNonJvm6And7(f: () -> Unit) {
-    f()
-}
-
 actual fun testOnJvm(action: () -> Unit) {}
 actual fun testOnJs(action: () -> Unit) {}
 
 
 public actual val isFloat32RangeEnforced: Boolean get() = true
 
-public actual val supportsSuppressedExceptions: Boolean get() = true
-
 public actual val supportsNamedCapturingGroup: Boolean get() = true
 
 public actual val supportsOctalLiteralInRegex: Boolean get() = true
diff --git a/libraries/stdlib/common/test/testUtils.kt b/libraries/stdlib/common/test/testUtils.kt
index 5d2e02d3682..9b5ffaf3ee8 100644
--- a/libraries/stdlib/common/test/testUtils.kt
+++ b/libraries/stdlib/common/test/testUtils.kt
@@ -7,17 +7,11 @@ package test
 
 public expect fun assertTypeEquals(expected: Any?, actual: Any?)
 
-internal expect fun String.removeLeadingPlusOnJava6(): String
-
-internal expect inline fun testOnNonJvm6And7(f: () -> Unit)
-
 public expect fun testOnJvm(action: () -> Unit)
 public expect fun testOnJs(action: () -> Unit)
 
 public expect val isFloat32RangeEnforced: Boolean
 
-public expect val supportsSuppressedExceptions: Boolean
-
 public expect val supportsNamedCapturingGroup: Boolean
 
 public expect val supportsOctalLiteralInRegex: Boolean
diff --git a/libraries/stdlib/jdk7/build.gradle b/libraries/stdlib/jdk7/build.gradle
index b1328dc1cbe..65dfcc577ce 100644
--- a/libraries/stdlib/jdk7/build.gradle
+++ b/libraries/stdlib/jdk7/build.gradle
@@ -79,6 +79,10 @@ compileTestKotlin {
     ]
 }
 
+tasks.withType(Test) {
+    systemProperty("supportsNamedCapturingGroup", false)
+}
+
 configureFrontendIr(project)
 
 LibrariesCommon.configureJava9Compilation(project, 'kotlin.stdlib.jdk7')
diff --git a/libraries/stdlib/js/test/core/testUtils.kt b/libraries/stdlib/js/test/core/testUtils.kt
index 03f000201af..742834bd55f 100644
--- a/libraries/stdlib/js/test/core/testUtils.kt
+++ b/libraries/stdlib/js/test/core/testUtils.kt
@@ -11,13 +11,6 @@ public actual fun assertTypeEquals(expected: Any?, actual: Any?) {
     assertEquals(expected?.let { it::class.js }, actual?.let { it::class.js })
 }
 
-@Suppress("NOTHING_TO_INLINE")
-internal actual inline fun String.removeLeadingPlusOnJava6(): String = this
-
-internal actual inline fun testOnNonJvm6And7(f: () -> Unit) {
-    f()
-}
-
 
 public actual fun testOnJvm(action: () -> Unit) { }
 public actual fun testOnJs(action: () -> Unit) = action()
@@ -25,8 +18,6 @@ public actual fun testOnJs(action: () -> Unit) = action()
 // TODO: should be true at least in JS IR after implementing KT-24975
 public actual val isFloat32RangeEnforced: Boolean = false
 
-actual val supportsSuppressedExceptions: Boolean get() = true
-
 public actual val supportsNamedCapturingGroup: Boolean get() = true
 
 public actual val supportsOctalLiteralInRegex: Boolean get() = false
diff --git a/libraries/stdlib/jvm/build.gradle b/libraries/stdlib/jvm/build.gradle
index ecb2456b7e1..f56b1284e07 100644
--- a/libraries/stdlib/jvm/build.gradle
+++ b/libraries/stdlib/jvm/build.gradle
@@ -133,6 +133,10 @@ compileTestKotlin {
     }
 }
 
+test {
+    systemProperty("supportsNamedCapturingGroup", false)
+}
+
 compileLongRunningTestKotlin {
     kotlinOptions.freeCompilerArgs += "-opt-in=kotlin.ExperimentalStdlibApi"
 }
diff --git a/libraries/stdlib/jvm/src/kotlin/internal/PlatformImplementations.kt b/libraries/stdlib/jvm/src/kotlin/internal/PlatformImplementations.kt
index 950ea19d139..ad213cb9a6e 100644
--- a/libraries/stdlib/jvm/src/kotlin/internal/PlatformImplementations.kt
+++ b/libraries/stdlib/jvm/src/kotlin/internal/PlatformImplementations.kt
@@ -48,24 +48,18 @@ internal open class PlatformImplementations {
 
 @JvmField
 internal val IMPLEMENTATIONS: PlatformImplementations = run {
-    val version = getJavaVersion()
-    if (version >= 0x10008 || version < 0x10000) {
-        try {
-            return@run castToBaseType<PlatformImplementations>(Class.forName("kotlin.internal.jdk8.JDK8PlatformImplementations").newInstance())
-        } catch (e: ClassNotFoundException) { }
-        try {
-            return@run castToBaseType<PlatformImplementations>(Class.forName("kotlin.internal.JRE8PlatformImplementations").newInstance())
-        } catch (e: ClassNotFoundException) { }
-    }
-
-    if (version >= 0x10007 || version < 0x10000) {
-        try {
-            return@run castToBaseType<PlatformImplementations>(Class.forName("kotlin.internal.jdk7.JDK7PlatformImplementations").newInstance())
-        } catch (e: ClassNotFoundException) { }
-        try {
-            return@run castToBaseType<PlatformImplementations>(Class.forName("kotlin.internal.JRE7PlatformImplementations").newInstance())
-        } catch (e: ClassNotFoundException) { }
-    }
+    try {
+        return@run castToBaseType<PlatformImplementations>(Class.forName("kotlin.internal.jdk8.JDK8PlatformImplementations").newInstance())
+    } catch (e: ClassNotFoundException) { }
+    try {
+        return@run castToBaseType<PlatformImplementations>(Class.forName("kotlin.internal.JRE8PlatformImplementations").newInstance())
+    } catch (e: ClassNotFoundException) { }
+    try {
+        return@run castToBaseType<PlatformImplementations>(Class.forName("kotlin.internal.jdk7.JDK7PlatformImplementations").newInstance())
+    } catch (e: ClassNotFoundException) { }
+    try {
+        return@run castToBaseType<PlatformImplementations>(Class.forName("kotlin.internal.JRE7PlatformImplementations").newInstance())
+    } catch (e: ClassNotFoundException) { }
 
     PlatformImplementations()
 }
@@ -84,25 +78,6 @@ private inline fun <reified T : Any> castToBaseType(instance: Any): T {
     }
 }
 
-private fun getJavaVersion(): Int {
-    val default = 0x10006
-    val version = System.getProperty("java.specification.version") ?: return default
-    val firstDot = version.indexOf('.')
-    if (firstDot < 0)
-        return try { version.toInt() * 0x10000 } catch (e: NumberFormatException) { default }
-
-    var secondDot = version.indexOf('.', firstDot + 1)
-    if (secondDot < 0) secondDot = version.length
-
-    val firstPart = version.substring(0, firstDot)
-    val secondPart = version.substring(firstDot + 1, secondDot)
-    return try {
-        firstPart.toInt() * 0x10000 + secondPart.toInt()
-    } catch (e: NumberFormatException) {
-        default
-    }
-}
-
 /**
  * Constant check of api version used during compilation
  *
diff --git a/libraries/stdlib/jvm/test/exceptions/ExceptionJVMTest.kt b/libraries/stdlib/jvm/test/exceptions/ExceptionJVMTest.kt
index ec515323019..a6d726da43c 100644
--- a/libraries/stdlib/jvm/test/exceptions/ExceptionJVMTest.kt
+++ b/libraries/stdlib/jvm/test/exceptions/ExceptionJVMTest.kt
@@ -6,7 +6,6 @@
 package test.exceptions
 
 import test.collections.assertArrayNotSameButEquals
-import test.testOnJvm7AndAbove
 import java.io.*
 import java.nio.charset.Charset
 import kotlin.test.*
@@ -96,9 +95,8 @@ class ExceptionJVMTest {
         e1.initCause(e2)
         assertSame(e1, e2.cause)
         assertSame(e2, e1.cause)
-        testOnJvm7AndAbove {
-            val trace = e2.stackTraceToString()
-            assertTrue("CIRCULAR REFERENCE" in trace, trace)
-        }
+
+        val trace = e2.stackTraceToString()
+        assertTrue("CIRCULAR REFERENCE" in trace, trace)
     }
 }
diff --git a/libraries/stdlib/jvm/test/testUtilsJVM.kt b/libraries/stdlib/jvm/test/testUtilsJVM.kt
index de8b0efd1b6..22a7d06535d 100644
--- a/libraries/stdlib/jvm/test/testUtilsJVM.kt
+++ b/libraries/stdlib/jvm/test/testUtilsJVM.kt
@@ -12,25 +12,6 @@ public actual fun assertTypeEquals(expected: Any?, actual: Any?) {
     assertEquals(expected?.javaClass, actual?.javaClass)
 }
 
-private val isJava6 = System.getProperty("java.version").startsWith("1.6.")
-
-internal actual fun String.removeLeadingPlusOnJava6(): String =
-    if (isJava6) removePrefix("+") else this
-
-private val isJava7 = System.getProperty("java.version").startsWith("1.7.")
-
-private val isJava8AndAbove = !isJava6 && !isJava7
-
-internal actual inline fun testOnNonJvm6And7(f: () -> Unit) {
-    if (isJava8AndAbove) {
-        f()
-    }
-}
-internal inline fun testOnJvm7AndAbove(f: () -> Unit) {
-    if (!isJava6) {
-        f()
-    }
-}
 public actual fun testOnJvm(action: () -> Unit) = action()
 public actual fun testOnJs(action: () -> Unit) {}
 
@@ -39,10 +20,8 @@ public fun <T> platformNull() = Collections.singletonList(null as T).first()
 
 public actual val isFloat32RangeEnforced: Boolean = true
 
-public actual val supportsSuppressedExceptions: Boolean get() = !isJava6
-
-// Named capturing groups are supported starting from java 7. However, retrieving them by name is not supported in java 7.
-public actual val supportsNamedCapturingGroup: Boolean get() = isJava8AndAbove
+public actual val supportsNamedCapturingGroup: Boolean
+    get() = System.getProperty("supportsNamedCapturingGroup")?.toBooleanStrict() ?: true
 
 public actual val supportsOctalLiteralInRegex: Boolean get() = true
 
diff --git a/libraries/stdlib/test/collections/AbstractCollectionsTest.kt b/libraries/stdlib/test/collections/AbstractCollectionsTest.kt
index 8de56a93de4..2d6bebb229d 100644
--- a/libraries/stdlib/test/collections/AbstractCollectionsTest.kt
+++ b/libraries/stdlib/test/collections/AbstractCollectionsTest.kt
@@ -6,7 +6,6 @@
 package test.collections
 
 import test.collections.behaviors.*
-import test.testOnNonJvm6And7
 import kotlin.test.*
 
 class AbstractCollectionsTest {
@@ -128,9 +127,7 @@ class AbstractCollectionsTest {
 
         assertEquals(listOf("ok", "element"), list)
 
-        testOnNonJvm6And7 {
-            assertFailsWith<IndexOutOfBoundsException> { list.addAll(-1, listOf()) }
-        }
+        assertFailsWith<IndexOutOfBoundsException> { list.addAll(-1, listOf()) }
 
         compare(list.storage, list) {
             listBehavior()
diff --git a/libraries/stdlib/test/exceptions/ExceptionTest.kt b/libraries/stdlib/test/exceptions/ExceptionTest.kt
index 0c44ea831ba..49fb408c02c 100644
--- a/libraries/stdlib/test/exceptions/ExceptionTest.kt
+++ b/libraries/stdlib/test/exceptions/ExceptionTest.kt
@@ -5,7 +5,6 @@
 
 package test.exceptions
 
-import test.supportsSuppressedExceptions
 import kotlin.test.*
 
 @Suppress("Reformat") // author's formatting
@@ -81,11 +80,7 @@ class ExceptionTest {
         e1.addSuppressed(c1)
         e1.addSuppressed(c2)
 
-        if (supportsSuppressedExceptions) {
-            assertEquals(listOf(c1, c2), e1.suppressedExceptions)
-        } else {
-            assertTrue(e1.suppressedExceptions.isEmpty())
-        }
+        assertEquals(listOf(c1, c2), e1.suppressedExceptions)
     }
 
     @Test
@@ -122,12 +117,10 @@ class ExceptionTest {
         val cause = assertNotNull(e.cause, "Should have cause")
         assertInTrace(cause)
 
-        if (supportsSuppressedExceptions) {
-            val topLevelSuppressed = e.suppressedExceptions.single()
-            assertInTrace(topLevelSuppressed)
-            cause.suppressedExceptions.forEach {
-                assertInTrace(it)
-            }
+        val topLevelSuppressed = e.suppressedExceptions.single()
+        assertInTrace(topLevelSuppressed)
+        cause.suppressedExceptions.forEach {
+            assertInTrace(it)
         }
 
 //        fail(topLevelTrace) // to dump the entire trace
@@ -135,8 +128,6 @@ class ExceptionTest {
 
     @Test
     fun circularSuppressedDetailedTrace() {
-        if (!supportsSuppressedExceptions) return
-
         // Testing an exception of the following structure
         // e1
         //    -- suppressed: e0 (same stack as e1)
diff --git a/libraries/stdlib/test/text/CharTest.kt b/libraries/stdlib/test/text/CharTest.kt
index ffef7d6af4c..6207b56be02 100644
--- a/libraries/stdlib/test/text/CharTest.kt
+++ b/libraries/stdlib/test/text/CharTest.kt
@@ -5,7 +5,6 @@
 
 package test.text
 
-import test.testOnNonJvm6And7
 import kotlin.test.*
 
 class CharTest {
@@ -525,32 +524,28 @@ class CharTest {
 
     @Test
     fun otherLowercaseProperty() {
-        testOnNonJvm6And7 {
-            val feminineOrdinalIndicator = '\u00AA'
-            assertTrue(feminineOrdinalIndicator.isLowerCase())
-            assertTrue(feminineOrdinalIndicator.isLetter())
-            assertFalse(feminineOrdinalIndicator.isUpperCase())
+        val feminineOrdinalIndicator = '\u00AA'
+        assertTrue(feminineOrdinalIndicator.isLowerCase())
+        assertTrue(feminineOrdinalIndicator.isLetter())
+        assertFalse(feminineOrdinalIndicator.isUpperCase())
 
-            val circledLatinSmallLetterA = '\u24D0'
-            assertTrue(circledLatinSmallLetterA.isLowerCase())
-            assertFalse(circledLatinSmallLetterA.isLetter())
-            assertFalse(circledLatinSmallLetterA.isUpperCase())
-        }
+        val circledLatinSmallLetterA = '\u24D0'
+        assertTrue(circledLatinSmallLetterA.isLowerCase())
+        assertFalse(circledLatinSmallLetterA.isLetter())
+        assertFalse(circledLatinSmallLetterA.isUpperCase())
     }
 
     @Test
     fun otherUppercaseProperty() {
-        testOnNonJvm6And7 {
-            val romanNumberOne = '\u2160'
-            assertTrue(romanNumberOne.isUpperCase())
-            assertFalse(romanNumberOne.isLetter())
-            assertFalse(romanNumberOne.isLowerCase())
+        val romanNumberOne = '\u2160'
+        assertTrue(romanNumberOne.isUpperCase())
+        assertFalse(romanNumberOne.isLetter())
+        assertFalse(romanNumberOne.isLowerCase())
 
-            val circledLatinCapitalLetterZ = '\u24CF'
-            assertTrue(circledLatinCapitalLetterZ.isUpperCase())
-            assertFalse(circledLatinCapitalLetterZ.isLetter())
-            assertFalse(circledLatinCapitalLetterZ.isLowerCase())
-        }
+        val circledLatinCapitalLetterZ = '\u24CF'
+        assertTrue(circledLatinCapitalLetterZ.isUpperCase())
+        assertFalse(circledLatinCapitalLetterZ.isLetter())
+        assertFalse(circledLatinCapitalLetterZ.isLowerCase())
     }
 
     @Test
diff --git a/libraries/stdlib/test/text/StringEncodingTest.kt b/libraries/stdlib/test/text/StringEncodingTest.kt
index 355bd1328b3..1a35cc06109 100644
--- a/libraries/stdlib/test/text/StringEncodingTest.kt
+++ b/libraries/stdlib/test/text/StringEncodingTest.kt
@@ -6,7 +6,6 @@
 package test.text
 
 import test.assertArrayContentEquals
-import test.testOnNonJvm6And7
 import kotlin.test.*
 
 // When decoding utf-8, JVM and JS implementations replace the sequence reflecting a surrogate code point differently.
@@ -207,28 +206,26 @@ class StringEncodingTest {
         testDecoding(false, "�z", bytes(0xE0, 0xAF, 0x7A)) // 3-byte char, third byte starts with 0 bit
         testDecoding(true, "\u1FFF", bytes(0xE1, 0xBF, 0xBF)) // 3-byte char
 
-        testOnNonJvm6And7 {
-            testDecoding(false, surrogateCodePointDecoding, bytes(0xED, 0xAF, 0xBF)) // 3-byte high-surrogate char
-            testDecoding(false, surrogateCodePointDecoding, bytes(0xED, 0xB3, 0x9A)) // 3-byte low-surrogate char
-            testDecoding(
-                false,
-                surrogateCodePointDecoding + surrogateCodePointDecoding,
-                bytes(0xED, 0xAF, 0xBF, /**/ 0xED, 0xB3, 0x9A)
-            ) // surrogate pair chars
-            testDecoding(false, "�z", bytes(0xEF, 0x7A)) // 3-byte char, second byte starts with 0 bit, third byte missing
+        testDecoding(false, surrogateCodePointDecoding, bytes(0xED, 0xAF, 0xBF)) // 3-byte high-surrogate char
+        testDecoding(false, surrogateCodePointDecoding, bytes(0xED, 0xB3, 0x9A)) // 3-byte low-surrogate char
+        testDecoding(
+            false,
+            surrogateCodePointDecoding + surrogateCodePointDecoding,
+            bytes(0xED, 0xAF, 0xBF, /**/ 0xED, 0xB3, 0x9A)
+        ) // surrogate pair chars
+        testDecoding(false, "�z", bytes(0xEF, 0x7A)) // 3-byte char, second byte starts with 0 bit, third byte missing
 
-            testDecoding(false, "�����", bytes(0xF9, 0x94, 0x80, 0x80, 0x80)) // 5-byte code point larger than 0x10FFFF
-            testDecoding(false, "������", bytes(0xFD, 0x94, 0x80, 0x80, 0x80, 0x80)) // 6-byte code point larger than 0x10FFFF
+        testDecoding(false, "�����", bytes(0xF9, 0x94, 0x80, 0x80, 0x80)) // 5-byte code point larger than 0x10FFFF
+        testDecoding(false, "������", bytes(0xFD, 0x94, 0x80, 0x80, 0x80, 0x80)) // 6-byte code point larger than 0x10FFFF
 
-            // Ill-Formed Sequences for Surrogates
-            testDecoding(
-                false,
-                surrogateCodePointDecoding + surrogateCodePointDecoding + truncatedSurrogateDecoding() + "A",
-                bytes(0xED, 0xA0, 0x80, /**/ 0xED, 0xBF, 0xBF, /**/ 0xED, 0xAF, /**/ 0x41)
-            )
-            // Truncated Sequences
-            testDecoding(false, "����A", bytes(0xE1, 0x80, /**/ 0xE2, /**/ 0xF0, 0x91, 0x92, /**/ 0xF1, 0xBF, /**/ 0x41))
-        }
+        // Ill-Formed Sequences for Surrogates
+        testDecoding(
+            false,
+            surrogateCodePointDecoding + surrogateCodePointDecoding + truncatedSurrogateDecoding() + "A",
+            bytes(0xED, 0xA0, 0x80, /**/ 0xED, 0xBF, 0xBF, /**/ 0xED, 0xAF, /**/ 0x41)
+        )
+        // Truncated Sequences
+        testDecoding(false, "����A", bytes(0xE1, 0x80, /**/ 0xE2, /**/ 0xF0, 0x91, 0x92, /**/ 0xF1, 0xBF, /**/ 0x41))
 
         testDecoding(false, "�", bytes(0xE0, 0xAF)) // 3-byte char, third byte missing
 
@@ -275,13 +272,11 @@ class StringEncodingTest {
         testDecoding(false, "�z", bytes(0xEF, 0xAF, 0x7A), startIndex = 1, endIndex = 3)
         testDecoding(true, "z", bytes(0xEF, 0xAF, 0x7A), startIndex = 2, endIndex = 3)
 
-        testOnNonJvm6And7 {
-            testDecoding(false, surrogateCodePointDecoding, bytes(0xED, 0xAF, 0xBF), startIndex = 0, endIndex = 3)
-            testDecoding(false, truncatedSurrogateDecoding(), bytes(0xED, 0xB3, 0x9A), startIndex = 0, endIndex = 2)
-            testDecoding(false, "���", bytes(0xED, 0xAF, 0xBF, 0xED, 0xB3, 0x9A), startIndex = 1, endIndex = 4)
-            testDecoding(false, "�", bytes(0xEF, 0x7A), startIndex = 0, endIndex = 1)
-            testDecoding(true, "z", bytes(0xEF, 0x7A), startIndex = 1, endIndex = 2)
-        }
+        testDecoding(false, surrogateCodePointDecoding, bytes(0xED, 0xAF, 0xBF), startIndex = 0, endIndex = 3)
+        testDecoding(false, truncatedSurrogateDecoding(), bytes(0xED, 0xB3, 0x9A), startIndex = 0, endIndex = 2)
+        testDecoding(false, "���", bytes(0xED, 0xAF, 0xBF, 0xED, 0xB3, 0x9A), startIndex = 1, endIndex = 4)
+        testDecoding(false, "�", bytes(0xEF, 0x7A), startIndex = 0, endIndex = 1)
+        testDecoding(true, "z", bytes(0xEF, 0x7A), startIndex = 1, endIndex = 2)
 
         testDecoding(true, "\uD83D\uDFDF", bytes(0xF0, 0x9F, 0x9F, 0x9F), startIndex = 0, endIndex = 4)
         testDecoding(false, "��", bytes(0xF0, 0x9F, 0x9F, 0x9F), startIndex = 2, endIndex = 4)
diff --git a/libraries/stdlib/test/text/StringNumberConversionTest.kt b/libraries/stdlib/test/text/StringNumberConversionTest.kt
index 5e5f048d81e..6960ea316bb 100644
--- a/libraries/stdlib/test/text/StringNumberConversionTest.kt
+++ b/libraries/stdlib/test/text/StringNumberConversionTest.kt
@@ -5,7 +5,6 @@
 
 package test.text
 
-import test.*
 import kotlin.test.*
 
 class StringNumberConversionTest {
@@ -439,7 +438,7 @@ internal class ConversionContext<T : Any>(
     }
 
     fun assertProduces(input: String, output: T) {
-        assertEquals(output, convertOrFail(input.removeLeadingPlusOnJava6()), input, "convertOrFail")
+        assertEquals(output, convertOrFail(input), input, "convertOrFail")
         assertEquals(output, convertOrNull(input), input, "convertOrNull")
     }
 
@@ -454,7 +453,7 @@ internal class ConversionWithRadixContext<T : Any>(
     val convertOrNull: (String, Int) -> T?
 ) {
     fun assertProduces(radix: Int, input: String, output: T) {
-        assertEquals(output, convertOrFail(input.removeLeadingPlusOnJava6(), radix))
+        assertEquals(output, convertOrFail(input, radix))
         assertEquals(output, convertOrNull(input, radix))
     }
 
diff --git a/libraries/stdlib/wasm/test/testUtils.kt b/libraries/stdlib/wasm/test/testUtils.kt
index ec6333e6c73..78d4c41031d 100644
--- a/libraries/stdlib/wasm/test/testUtils.kt
+++ b/libraries/stdlib/wasm/test/testUtils.kt
@@ -12,13 +12,6 @@ public actual fun assertTypeEquals(expected: Any?, actual: Any?) {
     assertEquals(expected?.let { it::class }, actual?.let { it::class })
 }
 
-@Suppress("NOTHING_TO_INLINE")
-internal actual inline fun String.removeLeadingPlusOnJava6(): String = this
-
-internal actual inline fun testOnNonJvm6And7(f: () -> Unit) {
-    f()
-}
-
 
 public actual fun testOnJvm(action: () -> Unit) { }
 public actual fun testOnJs(action: () -> Unit) { }
@@ -26,8 +19,6 @@ public actual fun testOnJs(action: () -> Unit) { }
 // TODO: See KT-24975
 public actual val isFloat32RangeEnforced: Boolean = false
 
-actual val supportsSuppressedExceptions: Boolean get() = true
-
 public actual val supportsNamedCapturingGroup: Boolean get() = true
 
 public actual val supportsOctalLiteralInRegex: Boolean get() = true