SI-8738 Regression in range equality

Missed the case of comparing a non-empty range to an empty one.  Fixed by checking nonEmpty/isEmpty on other collection.

Added a test to verify the behavior.

1 files changed, 16 insertions, 0 deletions

diff --git a/test/files/run/t8738.scala b/test/files/run/t8738.scala
new file mode 100644
index 0000000000..6898301db7
--- /dev/null
+++ b/test/files/run/t8738.scala
@@ -0,0 +1,16 @@
+object Test {
+  def check(a: Range, b: Range) = (a == b) == (a.toList == b.toList)
+  def main(args: Array[String]) {
+    val lo = -2 to 2
+    val hi = lo
+    val step = List(-6,-2,-1,1,2,6)
+    for (i <- lo; j <- hi; n <- step; k <- lo; l <- hi; m <- step) {
+      assert(
+        check(i until j by n, k until l by m) &&
+        check(i until j by n, k to l by m) &&
+        check(i to j by n, k until l by m) &&
+        check(i to j by n, k to l by m)
+      )
+    }
+  }
+}