[vala/wip/issue/894: 45/45] FIXME

[Rico Tzschichholz <ricotz src gnome org>]

commit 711d962523407056951b622b561f0de9b80e2383
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Wed Nov 11 15:05:08 2020 +0100

    FIXME

 tests/Makefile.am                          |  1 +
 tests/objects/type-narrowing-fallback.vala | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+)
---
diff --git a/tests/Makefile.am b/tests/Makefile.am
index ca85ba0c0..1addffef0 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -477,6 +477,7 @@ TESTS = \
        objects/signals-struct-return.vala \
        objects/singleton.vala \
        objects/type-narrowing.vala \
+       objects/type-narrowing-fallback.vala \
        objects/test-025.vala \
        objects/test-026.vala \
        objects/test-029.vala \
diff --git a/tests/objects/type-narrowing-fallback.vala b/tests/objects/type-narrowing-fallback.vala
new file mode 100644
index 000000000..130d7a10f
--- /dev/null
+++ b/tests/objects/type-narrowing-fallback.vala
@@ -0,0 +1,21 @@
+interface Foo : Object {
+       public abstract int get_foo ();
+}
+
+class Bar : Object {
+}
+
+class Manam : Bar, Foo {
+       public virtual int get_foo () {
+               return 42;
+       }
+}
+
+void main () {
+       Foo foo = new Manam ();
+       if (foo is Bar) {
+               assert (foo.get_foo () == 42);
+       } else {
+               assert_not_reached ();
+       }
+}