remove some unnecessary !! from stdlib

libraries/stdlib/src/kotlin/concurrent/Thread.kt

@@ -6,10 +6,10 @@ import java.util.concurrent.Future
 import java.util.concurrent.Callable
 
 inline val currentThread : Thread
-    get() = Thread.currentThread()!!
+    get() = Thread.currentThread()
 
 inline var Thread.name : String
-    get() = getName()!!
+    get() = getName()
     set(name: String) { setName(name) }
 
 inline var Thread.daemon : Boolean
@@ -66,7 +66,7 @@ public inline fun Executor.invoke(action: ()->Unit) {
  */
 public inline fun <T>ExecutorService.submit(action: ()->T):Future<T> {
     val c:Callable<T> = callable(action)
-    return submit(c)!!;
+    return submit(c);
 }
 
 /**

libraries/stdlib/src/kotlin/nullable/Nullables.kt

@@ -129,7 +129,7 @@ public inline fun <T> T?.makeString(separator: String = ", ", prefix: String = "
         buffer.append(this)
     }
     buffer.append(postfix)
-    return buffer.toString()!!
+    return buffer.toString()
 }
 
 

libraries/stdlib/src/kotlin/support/AbstractIterator.kt

@@ -108,7 +108,7 @@ class CompositeIterator<T>(vararg iterators: Iterator<T>): AbstractIterator<T>()
             val iter = currentIter
             if (iter != null) {
                 if (iter.hasNext()) {
-                    setNext(iter.next()!!)
+                    setNext(iter.next())
                     return
                 } else {
                     currentIter = null

libraries/stdlib/src/kotlin/template/Templates.kt

@@ -116,7 +116,7 @@ public open class ToStringFormatter : Formatter {
     }
 }
 
-public val defaultLocale : Locale = Locale.getDefault()!!
+public val defaultLocale : Locale = Locale.getDefault()
 
 /**
  * Formats values using a given [[Locale]] for internationalisation