Binding V1 fails to generate code for nested enumeration/union construct

    container foo {
        leaf bar {
            type union {
                type enumeration {
                    enum "foo";
                }
                type string {
                    length 2;
                }
                type union {
                    type enumeration {
                        enum bar;
                    }
                    type string {
                        length 1;
                    }
                }
            }
        }
    }

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.7.0:compile (default-compile) on project mdsal-binding-test-model: Compilation failure
[ERROR] /home/nite/odl/mdsal/binding/mdsal-binding-test-model/target/generated-sources/mdsal-binding/org/opendaylight/yang/gen/v1/opendaylight/nested/types/norev/Foo.java:[313,35] cannot find symbol
[ERROR]   symbol:   method getValue()
[ERROR]   location: variable _bar1 of type org.opendaylight.yang.gen.v1.opendaylight.nested.types.norev.Foo.Bar.Bar1