Makes BigInt's isValidThing methods make some k...

Makes BigInt's isValidThing methods make some kind of sense. I wish I
hadn't written so much code for the numerical classes which languishes
in git tributaries. Closes #4540, no review.

1 files changed, 20 insertions, 0 deletions

diff --git a/test/files/run/is-valid-num.scala b/test/files/run/is-valid-num.scala
new file mode 100644
index 0000000000..6e423e946e
--- /dev/null
+++ b/test/files/run/is-valid-num.scala
@@ -0,0 +1,20 @@
+object Test {
+  def x = BigInt("10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000")
+  def y = BigDecimal("" + (Short.MaxValue + 1) + ".0")
+
+  def l1 = Int.MaxValue.toLong + 1
+  def l2 = Int.MinValue.toLong - 1
+
+  def main(args: Array[String]): Unit = {
+    assert(!x.isValidLong, x)
+    assert(!x.isValidInt, x)
+    assert(!x.isValidChar, x)
+    assert(!x.isValidByte, x)
+    assert(!y.isValidShort, y)
+    assert(y.isValidChar, y)
+    assert(y.isValidInt, y)
+
+    assert(!l1.isValidInt && (l1 - 1).isValidInt, l1)
+    assert(!l2.isValidInt && (l2 + 1).isValidInt, l2)
+  }
+}