1 files changed, 21 insertions, 0 deletions
diff --git a/tests/run/t6052.scala b/tests/run/t6052.scala
new file mode 100644
index 000000000..e740f00e1
--- /dev/null
+++ b/tests/run/t6052.scala
@@ -0,0 +1,21 @@
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+object Test extends dotty.runtime.LegacyApp {
+  def seqarr(i: Int) = Array[Int]() ++ (0 until i)
+  def pararr(i: Int) = seqarr(i).par
+
+  def check[T](i: Int, f: Int => T): Unit = {
+    val gseq = seqarr(i).toSeq.groupBy(f)
+    val gpar = pararr(i).groupBy(f)
+    assert(gseq == gpar, (gseq, gpar))
+  }
+
+  for (i <- 0 until 20) check(i, _ > 0)
+  for (i <- 0 until 20) check(i, _ % 2)
+  for (i <- 0 until 20) check(i, _ % 4)
+}