Merge pull request #5280 from retronym/ticket/8079

SI-8079 Only expand local aliases during variance checks

3 files changed, 15 insertions, 0 deletions

diff --git a/test/pending/neg/t8079d.check b/test/pending/neg/t8079d.check
new file mode 100644
index 0000000000..f63f4902f8
--- /dev/null
+++ b/test/pending/neg/t8079d.check
@@ -0,0 +1,4 @@
+t8079d.scala:3: error: contravariant type I occurs in covariant position in type C.this.X of value b
+  def f2(b: X): Unit
+         ^
+one error found
diff --git a/test/pending/neg/t8079d.scala b/test/pending/neg/t8079d.scala
new file mode 100644
index 0000000000..ad420b99e3
--- /dev/null
+++ b/test/pending/neg/t8079d.scala
@@ -0,0 +1,4 @@
+trait C[-I] {
+  protected[this] type X = C[I]
+  def f2(b: X): Unit
+}
diff --git a/test/pending/pos/t8079c.scala b/test/pending/pos/t8079c.scala
new file mode 100644
index 0000000000..ae7f37e2bf
--- /dev/null
+++ b/test/pending/pos/t8079c.scala
@@ -0,0 +1,7 @@
+trait F1[/* - */T, /* + */ R]
+
+object Test {
+  import scala.annotation.unchecked._
+  private[this] type VariantF1[-T, +R] = F1[T @uncheckedVariance, R @uncheckedVariance]
+  trait C[+T] { def foo: VariantF1[Any, T] }
+}