Fix #3702: Drop failing assertion

The dropped assertion fails when we are looking for an annotation

Author: odersky

compiler/src/dotty/tools/dotc/typer/Namer.scala

@@ -48,7 +48,6 @@ trait NamerContextOps { this: Context =>
           val elem = scope.lastEntry
           if (elem.name == name) return elem.sym.denot // return self
         }
-        assert(scope.size <= 1, scope)
         owner.thisType.member(name)
       }
       else // we are in the outermost context belonging to a class; self is invisible here. See inClassContext.

tests/neg/i3702.scala

@@ -0,0 +1,8 @@
+object test {
+  class annot extends scala.annotation.Annotation
+  def foo = {
+    def bar(i: Int): Int = i
+    @annot class Silly {}
+    bar(5)
+  }
+}