#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/test/ExceptionTest.kt

@@ -0,0 +1,47 @@
+package test.collections
+
+import kotlin.test.*
+
+import java.util.*
+import org.junit.Test  as test
+import java.io.PrintWriter
+import java.io.*
+
+class ExceptionTest {
+
+    test fun printStackTraceOnRuntimeException() {
+        assertPrintStackTrace(RuntimeException("Crikey!"))
+        assertPrintStackTraceStream(RuntimeException("Crikey2"))
+    }
+
+    test fun printStackTraceOnError() {
+        assertPrintStackTrace(Error("Oh dear"))
+        assertPrintStackTraceStream(Error("Oh dear2"))
+    }
+
+
+    fun assertPrintStackTrace(t: Throwable) {
+        val buffer = StringWriter()
+        val writer = PrintWriter(buffer)
+        t.printStackTrace(writer)
+        println(buffer)
+    }
+
+    fun assertPrintStackTraceStream(t: Throwable) {
+        val byteBuffer = ByteArrayOutputStream()
+/*
+        // TODO compiler error
+        PrintStream(byteBuffer).use {
+            t.printStackTrace(it)
+        }
+*/
+        val stream = PrintStream(byteBuffer)
+        stream.use {
+            t.printStackTrace(stream)
+        }
+
+        assertNotNull(byteBuffer.toByteArray()) { bytes ->
+            assertTrue(bytes.size > 10)
+        }
+    }
+}