Fix #4184: Add regression test

Author: nicolasstucki

compiler/test-resources/repl/i4184

@@ -0,0 +1,12 @@
+scala> object foo { class Foo }
+// defined object foo
+scala> object bar { class Foo }
+// defined object bar
+scala> object Bar { new foo.Foo == (new foo.Foo: bar.Foo) }
+1 | object Bar { new foo.Foo == (new foo.Foo: bar.Foo) }
+  |                              ^^^^^^^^^^^
+  |                              Found:    foo.Foo
+  |                              Required: bar.Foo'
+  |
+  |                              where:    Foo  is a class in object foo
+  |                                        Foo' is a class in object bar

tests/pos/i4184.scala

@@ -0,0 +1,3 @@
+object Bar {
+  true == (true: java.lang.Boolean)
+}