Fix some warnings in JS-specific stdlib sources

js/js.libraries/src/core/javaio.kt

@@ -5,7 +5,7 @@ public class IOException(message: String = "") : Exception() {}
 
 @library
 public interface Closeable {
-    public open fun close(): Unit
+    public fun close(): Unit
 }
 
 interface Serializable

js/js.libraries/src/core/javalang.kt

@@ -16,10 +16,9 @@
 
 package java.lang
 
-
 @library
 public interface Runnable {
-    public open fun run(): Unit
+    public fun run(): Unit
 }
 
 public fun Runnable(action: () -> Unit): Runnable = object : Runnable {
@@ -28,9 +27,9 @@ public fun Runnable(action: () -> Unit): Runnable = object : Runnable {
 
 @library
 public interface Appendable {
-    public open fun append(csq: CharSequence?): Appendable
-    public open fun append(csq: CharSequence?, start: Int, end: Int): Appendable
-    public open fun append(c: Char): Appendable
+    public fun append(csq: CharSequence?): Appendable
+    public fun append(csq: CharSequence?, start: Int, end: Int): Appendable
+    public fun append(c: Char): Appendable
 }
 
 @library

js/js.libraries/src/core/javautil.kt

@@ -18,11 +18,11 @@ package java.util
 
 @library
 public interface Comparator<T> {
-    public fun compare(obj1: T, obj2: T): Int
+    public fun compare(a: T, b: T): Int
 }
 
 public inline fun <T> Comparator(crossinline comparison: (T, T) -> Int): Comparator<T> = object : Comparator<T> {
-    override fun compare(obj1: T, obj2: T): Int = comparison(obj1, obj2)
+    override fun compare(a: T, b: T): Int = comparison(a, b)
 }
 
 

js/js.libraries/src/core/kotlin_special.kt

@@ -499,7 +499,7 @@ public inline fun <T> Array<out T>.plusElement(element: T): Array<T> {
  */
 @library("primitiveArraySort")
 public fun ByteArray.sort(): Unit {
-    return noImpl
+    noImpl
 }
 
 /**
@@ -507,7 +507,7 @@ public fun ByteArray.sort(): Unit {
  */
 @library("primitiveArraySort")
 public fun CharArray.sort(): Unit {
-    return noImpl
+    noImpl
 }
 
 /**
@@ -515,7 +515,7 @@ public fun CharArray.sort(): Unit {
  */
 @library("primitiveArraySort")
 public fun DoubleArray.sort(): Unit {
-    return noImpl
+    noImpl
 }
 
 /**
@@ -523,7 +523,7 @@ public fun DoubleArray.sort(): Unit {
  */
 @library("primitiveArraySort")
 public fun FloatArray.sort(): Unit {
-    return noImpl
+    noImpl
 }
 
 /**
@@ -531,7 +531,7 @@ public fun FloatArray.sort(): Unit {
  */
 @library("primitiveArraySort")
 public fun IntArray.sort(): Unit {
-    return noImpl
+    noImpl
 }
 
 /**
@@ -539,7 +539,7 @@ public fun IntArray.sort(): Unit {
  */
 @library("primitiveArraySort")
 public fun ShortArray.sort(): Unit {
-    return noImpl
+    noImpl
 }
 
 /**
@@ -563,7 +563,7 @@ public fun LongArray.sort(): Unit {
  */
 @native
 public fun <T> Array<out T>.sort(comparison: (T, T) -> Int): Unit {
-    return noImpl
+    noImpl
 }
 
 /**
@@ -571,7 +571,7 @@ public fun <T> Array<out T>.sort(comparison: (T, T) -> Int): Unit {
  */
 @native
 public fun ByteArray.sort(comparison: (Byte, Byte) -> Int): Unit {
-    return noImpl
+    noImpl
 }
 
 /**
@@ -579,7 +579,7 @@ public fun ByteArray.sort(comparison: (Byte, Byte) -> Int): Unit {
  */
 @native
 public fun CharArray.sort(comparison: (Char, Char) -> Int): Unit {
-    return noImpl
+    noImpl
 }
 
 /**
@@ -587,7 +587,7 @@ public fun CharArray.sort(comparison: (Char, Char) -> Int): Unit {
  */
 @native
 public fun DoubleArray.sort(comparison: (Double, Double) -> Int): Unit {
-    return noImpl
+    noImpl
 }
 
 /**
@@ -595,7 +595,7 @@ public fun DoubleArray.sort(comparison: (Double, Double) -> Int): Unit {
  */
 @native
 public fun FloatArray.sort(comparison: (Float, Float) -> Int): Unit {
-    return noImpl
+    noImpl
 }
 
 /**
@@ -603,7 +603,7 @@ public fun FloatArray.sort(comparison: (Float, Float) -> Int): Unit {
  */
 @native
 public fun IntArray.sort(comparison: (Int, Int) -> Int): Unit {
-    return noImpl
+    noImpl
 }
 
 /**
@@ -611,7 +611,7 @@ public fun IntArray.sort(comparison: (Int, Int) -> Int): Unit {
  */
 @native
 public fun LongArray.sort(comparison: (Long, Long) -> Int): Unit {
-    return noImpl
+    noImpl
 }
 
 /**
@@ -619,7 +619,7 @@ public fun LongArray.sort(comparison: (Long, Long) -> Int): Unit {
  */
 @native
 public fun ShortArray.sort(comparison: (Short, Short) -> Int): Unit {
-    return noImpl
+    noImpl
 }
 
 /**