Infer type parameters of anonymous class parents from expected type

If a parent type of an anonymous class is an Ident or Select which refers
to a parameterized type, use the expected type to infer its type parameters.

Fixes #1803.

1 files changed, 7 insertions, 0 deletions

diff --git a/tests/pos/i1803.scala b/tests/pos/i1803.scala
new file mode 100644
index 000000000..19bf21918
--- /dev/null
+++ b/tests/pos/i1803.scala
@@ -0,0 +1,7 @@
+class C[T]
+
+object Test {
+  def f(x: C[Int]) = ???
+
+  f(new C {})
+}