From 552776f00b114478322a5281502253a9838128cc Mon Sep 17 00:00:00 2001
From: Ilya Ryzhenkov <orangy@jetbrains.com>
Date: Mon, 17 Mar 2014 18:26:53 +0400
Subject: [PATCH] Output fixed for builtins serializer

---
 compiler/builtins-serializer/src/run.kt | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/compiler/builtins-serializer/src/run.kt b/compiler/builtins-serializer/src/run.kt
index c1123d8c5c1..f06aa2882bf 100644
--- a/compiler/builtins-serializer/src/run.kt
+++ b/compiler/builtins-serializer/src/run.kt
@@ -25,7 +25,7 @@ fun main(args: Array<String>) {
         println(
 """Kotlin built-ins serializer
 
-Usage: ... <destination dir> (<built-ins src dir>)+
+Usage: ... <destination dir> (<source dir>)+
 
 Analyzes Kotlin sources found in the given source directories and serializes
 found top-level declarations to <destination dir> (files such as
@@ -36,8 +36,11 @@ found top-level declarations to <destination dir> (files such as
 
     val destDir = File(args[0])
 
-    val srcDirs = args.iterator().skip(1).map({ File(it) }).toList()
-    assert(srcDirs all { it.exists() }) { "Some of the built-ins source directories don't exist: $srcDirs" }
+    val srcDirs = args drop(1) map { File(it) }
+    assert(srcDirs.isNotEmpty()) { "At least one source directory should be specified" }
+
+    val missing = srcDirs filterNot { it.exists() }
+    assert(missing.isEmpty()) { "These source directories are missing: $missing" }
 
     BuiltInsSerializer(System.out).serialize(destDir, srcDirs)
 }