SI-7228, bug in weak subtyping.

Another in the category of bugs which involve narrowing,
widening, mediuming, dealiasing, weakening, normalizing,
denormalizing, supernormalizing, subnormalizing, and
double-bounded supersubnormalizing.

This is probably not the ideal fix, but it is an improvement.

1 files changed, 75 insertions, 0 deletions

diff --git a/test/files/pos/t7228.scala b/test/files/pos/t7228.scala
new file mode 100644
index 0000000000..5d936f6529
--- /dev/null
+++ b/test/files/pos/t7228.scala
@@ -0,0 +1,75 @@
+object AdaptWithWeaklyConformantType {
+  implicit class D(d: Double) { def double = d*2 }
+
+  val x1: Int = 1
+  var x2: Int = 2
+  val x3 = 3
+  var x4 = 4
+  final val x5 = 5
+  final var x6 = 6
+
+  def f1 = x1.double
+  def f2 = x2.double
+  def f3 = x3.double
+  def f4 = x4.double
+  def f5 = x5.double
+  def f6 = x6.double
+}
+
+object AdaptAliasWithWeaklyConformantType {
+  implicit class D(d: Double) { def double = d*2 }
+  type T = Int
+
+  val x1: T = 1
+  var x2: T = 2
+  val x3 = (3: T)
+  var x4 = (4: T)
+  final val x5 = (5: T)
+  final var x6 = (6: T)
+
+  def f1 = x1.double
+  def f2 = x2.double
+  def f3 = x3.double
+  def f4 = x4.double
+  def f5 = x5.double
+  def f6 = x6.double
+}
+
+object AdaptToAliasWithWeaklyConformantType {
+  type U = Double
+  implicit class D(d: U) { def double = d*2 }
+
+  val x1: Int = 1
+  var x2: Int = 2
+  val x3 = (3: Int)
+  var x4 = (4: Int)
+  final val x5 = (5: Int)
+  final var x6 = (6: Int)
+
+  def f1 = x1.double
+  def f2 = x2.double
+  def f3 = x3.double
+  def f4 = x4.double
+  def f5 = x5.double
+  def f6 = x6.double
+}
+
+object AdaptAliasToAliasWithWeaklyConformantType {
+  type U = Double
+  type T = Int
+  implicit class D(d: U) { def double = d*2 }
+
+  val x1: T = 1
+  var x2: T = 2
+  val x3 = (3: T)
+  var x4 = (4: T)
+  final val x5 = (5: T)
+  final var x6 = (6: T)
+
+  def f1 = x1.double
+  def f2 = x2.double
+  def f3 = x3.double
+  def f4 = x4.double
+  def f5 = x5.double
+  def f6 = x6.double
+}