#KT-1785 Fixed. adds printStrackTrace(writer|stream) to Throwable so that the intrinsic Throwable behaves more like java.lang.Throwable. (Though not totally sure why we don't just siwzzle Throwable -> java.lang.Throwable like we do for Collection et al)

libraries/stdlib/src/kotlin/Standard.kt

@@ -8,6 +8,8 @@ import java.util.LinkedHashSet
 import java.util.TreeSet
 import java.util.SortedSet
 import java.util.Comparator
+import java.io.PrintWriter
+import java.io.PrintStream
 
 /**
 Helper to make jet.Iterator usable in for
@@ -96,4 +98,20 @@ public inline fun runnable(action: ()-> Unit): Runnable {
             action()
         }
     }
+}
+
+/**
+ * Allows a stack trace to be printed from Kotlin's [[Throwable]]
+ */
+public inline fun Throwable.printStackTrace(writer: PrintWriter): Unit {
+    val jlt = this as java.lang.Throwable
+    jlt.printStackTrace(writer)
+}
+
+/**
+ * Allows a stack trace to be printed from Kotlin's [[Throwable]]
+ */
+public inline fun Throwable.printStackTrace(stream: PrintStream): Unit {
+    val jlt = this as java.lang.Throwable
+    jlt.printStackTrace(stream)
 }

libraries/stdlib/src/kotlin/test/Test.kt

@@ -67,6 +67,14 @@ public inline fun assertNotNull(actual: Any?, message: String = "") {
     asserter.assertNotNull(message, actual)
 }
 
+/** Asserts that the expression is not null, with an optional message and a function block to process the not-null value */
+public inline fun <T, R> assertNotNull(actual: T?, message: String = "", block: (T) -> R) {
+    asserter.assertNotNull(message, actual)
+    if (actual != null) {
+        block(actual)
+    }
+}
+
 /** Asserts that the expression is null, with an optional message */
 public inline fun assertNull(actual: Any?, message: String = "") {
     asserter.assertNull(message, actual)