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-rw-r--r--src/dotty/annotation/internal/ContravariantBetween.scala3
-rw-r--r--src/dotty/annotation/internal/CovariantBetween.scala3
-rw-r--r--src/dotty/annotation/internal/InvariantBetween.scala3
3 files changed, 9 insertions, 0 deletions
diff --git a/src/dotty/annotation/internal/ContravariantBetween.scala b/src/dotty/annotation/internal/ContravariantBetween.scala
new file mode 100644
index 000000000..7eb068b89
--- /dev/null
+++ b/src/dotty/annotation/internal/ContravariantBetween.scala
@@ -0,0 +1,3 @@
+package dotty.annotation.internal
+
+trait ContravariantBetween[-Lo, +Hi] \ No newline at end of file
diff --git a/src/dotty/annotation/internal/CovariantBetween.scala b/src/dotty/annotation/internal/CovariantBetween.scala
new file mode 100644
index 000000000..d65a5f1b9
--- /dev/null
+++ b/src/dotty/annotation/internal/CovariantBetween.scala
@@ -0,0 +1,3 @@
+package dotty.annotation.internal
+
+trait CovariantBetween[-Lo, +Hi] \ No newline at end of file
diff --git a/src/dotty/annotation/internal/InvariantBetween.scala b/src/dotty/annotation/internal/InvariantBetween.scala
new file mode 100644
index 000000000..bf572b66c
--- /dev/null
+++ b/src/dotty/annotation/internal/InvariantBetween.scala
@@ -0,0 +1,3 @@
+package dotty.annotation.internal
+
+trait InvariantBetween[-Lo, +Hi] \ No newline at end of file