1 files changed, 13 insertions, 0 deletions
diff --git a/tests/untried/pos/t5779-numeq-warn.scala b/tests/untried/pos/t5779-numeq-warn.scala
new file mode 100644
index 000000000..61fd734f9
--- /dev/null
+++ b/tests/untried/pos/t5779-numeq-warn.scala
@@ -0,0 +1,13 @@
+
+object Test {
+  def main(args: Array[String]): Unit = {
+    val d: Double = (BigInt(1) << 64).toDouble
+    val f: Float = d.toFloat
+    val n: java.lang.Number = d.toFloat
+    assert (d == f)   // ok
+    assert (d == n)   // was: comparing values of types Double and Number using `==' will always yield false
+    assert (n == d)   // was: Number and Double are unrelated: they will most likely never compare equal
+    assert (f == n)
+    assert (n == f)
+  }
+}