fix

vlib/v/checker/checker.v

@@ -1056,7 +1056,7 @@ fn (mut c Checker) type_implements(typ ast.Type, interface_type ast.Type, pos to
 		inter_sym.methods
 	}
 	// voidptr is an escape hatch, it should be allowed to be passed
-	if utyp != ast.voidptr_type && utyp != ast.nil_type {
+	if utyp != ast.voidptr_type && utyp != ast.nil_type && utyp != ast.none_type {
 		mut are_methods_implemented := true
 
 		// Verify methods

vlib/v/tests/option_interface_test.v

@@ -0,0 +1,18 @@
+interface TestIntf {
+	test()
+}
+
+struct TestStruct {
+	ti ?TestIntf
+}
+
+fn TestStruct.new() TestStruct {
+	return TestStruct{
+		ti: none
+	}
+}
+
+fn test_main() {
+	t := TestStruct.new()
+	assert t.ti == none
+}