Enable 440 run tests that pass.

Note that some of them may pass due to several bugs that interfere.

1 files changed, 53 insertions, 0 deletions

diff --git a/tests/run/t8680.scala b/tests/run/t8680.scala
new file mode 100644
index 000000000..3c4bc8e7d
--- /dev/null
+++ b/tests/run/t8680.scala
@@ -0,0 +1,53 @@
+object Test extends dotty.runtime.LegacyApp {
+  def pre(n: Int) = (-n to -1).toStream
+
+  def cyc(m: Int) = {
+    lazy val s: Stream[Int] = (0 until m).toStream #::: s
+    s
+  }
+
+  def precyc(n: Int, m: Int) = pre(n) #::: cyc(m)
+
+  def str(s: Stream[Int]) = {
+    val b = new StringBuilder
+    s.addString(b, "", "", "")
+    b.toString
+  }
+
+  def goal(n: Int, m: Int) = (-n until m).mkString + "..."
+
+  // Check un-forced cyclic and non-cyclic streams
+  assert(str(pre(2)) == pre(2).take(1).toList.mkString + "?")
+  assert(str(cyc(2)) == cyc(2).take(1).toList.mkString + "?")
+  assert(str(precyc(2,2)) == precyc(2,2).take(1).toList.mkString + "?")
+  assert(!pre(2).hasDefiniteSize)
+  assert(!cyc(2).hasDefiniteSize)
+  assert(!precyc(2,2).hasDefiniteSize)
+
+  // Check forced cyclic and non-cyclic streams
+  assert(str(pre(2).force) == (-2 to -1).mkString)
+  assert(str(cyc(2).force) == (0 until 2).mkString + "...")
+  assert(str(precyc(2,2).force) == (-2 until 2).mkString + "...")
+  assert(pre(2).force.hasDefiniteSize)
+  assert(!cyc(2).force.hasDefiniteSize)
+  assert(!precyc(2,2).force.hasDefiniteSize)
+
+  // Special cases
+  assert(str(cyc(1).force) == goal(0,1))
+  assert(str(precyc(1,6).force) == goal(1,6))
+  assert(str(precyc(6,1).force) == goal(6,1))
+
+  // Make sure there are no odd/even problems
+  for (n <- 3 to 4; m <- 3 to 4) {
+    assert(precyc(n,m).mkString == goal(n,m), s"mkString $n $m")
+    assert(!precyc(n,m).force.hasDefiniteSize, s"hasDef $n$m")
+  }
+
+  // Make sure there are no cycle/prefix modulus problems
+  for (i <- 6 to 8) {
+    assert(precyc(i,3).mkString == goal(i,3), s"mkString $i 3")
+    assert(precyc(3,i).mkString == goal(3,i), s"mkString 3 $i")
+    assert(!precyc(i,3).force.hasDefiniteSize, s"hasDef $i 3")
+    assert(!precyc(3,i).force.hasDefiniteSize, s"hasDef 3 $i")
+  }
+}