Checking for already existing symbols before creating new ones.

Otherwise we get spurious "compiled twice" errors on every symbol defined in a run after the first one.
Also, fixed a bug so that now run ids are correctly incremented.

1 files changed, 13 insertions, 0 deletions

diff --git a/test/dotc/comptest.scala b/test/dotc/comptest.scala
new file mode 100644
index 000000000..fda5214cf
--- /dev/null
+++ b/test/dotc/comptest.scala
@@ -0,0 +1,13 @@
+package dotc
+
+import test._
+
+object comptest extends CompilerTest {
+
+  val posDir = "/Users/odersky/workspace/dotty/tests/pos/"
+  val negDir = "/Users/odersky/workspace/dotty/tests/neg/"
+  val dotcDir = "/Users/odersky/workspace/dotty/src/dotty/"
+
+  def main(args: Array[String]) =
+    compileFile(posDir, "typers", List("-Xprompt", "-Ylog:frontend", "#runs", "2"))
+}
\ No newline at end of file