vala: Don't just guess and check for a matching base_interface_method too

This fixes class with multiple interfaces which require implementations of
methods with conflicting naming while the explicit interface-type reference
is not present yet.

Extend the present test-case for runtime checking. This will still silently
connect matching base-class methods as before as introduced in
e1a3ff9470763e7c6ff5a887036390bd418f4e46

Fixes https://gitlab.gnome.org/GNOME/vala/issues/548

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/objects/interface-generics.vala b/tests/objects/interface-generics.vala
new file mode 100644
index 000000000..6fd9c29f8
--- /dev/null
+++ b/tests/objects/interface-generics.vala
@@ -0,0 +1,12 @@
+interface IFoo<G> : Object {
+	public abstract G get ();
+}
+
+class Foo<G> : Object, IFoo<G> {
+	public new G get () {
+		return null;
+	}
+}
+
+void main() {
+}