3 files changed, 66 insertions, 0 deletions
diff --git a/tests/neg/customArgs/overloadsOnAbstractTypes.scala b/tests/neg/customArgs/overloadsOnAbstractTypes.scala
new file mode 100644
index 000000000..0c9ed12bb
--- /dev/null
+++ b/tests/neg/customArgs/overloadsOnAbstractTypes.scala
@@ -0,0 +1,22 @@
+
+class Test1 {
+  type A
+  type B <: A
+
+  def foo(): A = ???
+  def foo(): A = ??? // error
+
+  def bar(): A = ???
+  def bar(): B = ??? // error
+}
+
+class Test2 {
+  type A
+  type B <: A
+
+  def foo(x: A) = ???
+  def foo(x: A) = ??? // error
+
+  def bar(x: A) = ???
+  def bar(x: B) = ??? // error
+}
diff --git a/tests/pos/i2152.scala b/tests/pos/i2152.scala
new file mode 100644
index 000000000..2171a487e
--- /dev/null
+++ b/tests/pos/i2152.scala
@@ -0,0 +1,7 @@
+class Contra[-D](task: AnyRef)
+object Test {
+  def narrow(task: AnyRef): Contra[task.type] = new Contra(task)
+  def ident[Before](elems: Contra[Before]): Contra[Before] = elems
+  val foo = null
+  ident(narrow(foo))
+}
diff --git a/tests/run/1938-2.scala b/tests/run/1938-2.scala
new file mode 100644
index 000000000..32e4c4518
--- /dev/null
+++ b/tests/run/1938-2.scala
@@ -0,0 +1,37 @@
+object ProdNonEmpty {
+  def _1: Int = 0
+  def _2: String = "???" // Slight variation with scalac: this test passes
+                         // with ??? here. I think dotty behavior is fine
+                         // according to the spec given that methods involved
+                         // in pattern matching should be pure.
+  def isEmpty = false
+  def unapply(s: String): this.type = this
+  def get = this
+}
+
+object ProdEmpty {
+  def _1: Int = ???
+  def _2: String = ???
+  def isEmpty = true
+  def unapply(s: String): this.type = this
+  def get = this
+}
+
+object Test {
+  def main(args: Array[String]): Unit = {
+    "" match {
+      case ProdNonEmpty(0, _) => ()
+      case _ => ???
+    }
+
+    "" match {
+      case ProdNonEmpty(1, _) => ???
+      case _ => ()
+    }
+
+    "" match {
+      case ProdEmpty(_, _) => ???
+      case _ => ()
+    }
+  }
+}