SI-8046 Fix baseTypeSeq in presence of type aliases

1 files changed, 20 insertions, 0 deletions

diff --git a/test/files/pos/t8046.scala b/test/files/pos/t8046.scala
new file mode 100644
index 0000000000..304d70b6b8
--- /dev/null
+++ b/test/files/pos/t8046.scala
@@ -0,0 +1,20 @@
+trait One {
+  type Op[A]
+  type Alias[A] = Op[A]
+}
+ 
+trait Two extends One {
+  trait Op[A] extends (A => A)
+ 
+  // This compiles
+  class View1 extends Op[Int] { def apply(xs: Int) = xs }
+ 
+  // ??? base class View2 not found in basetypes of class View2
+  // ./a.scala:9: error: class View2 needs to be abstract, since \
+  //   method apply in trait Function1 of type (v1: T1)R is not defined
+  // (Note that T1 does not match Int)
+  //   class View2 extends Alias[Int] { def apply(xs: Int) = xs }
+  //         ^
+  // one error found
+  class View2 extends Alias[Int] { def apply(xs: Int) = xs }
+}