Generated code conflict not reported by yangtools

When using sal code generator with yang maven plugin on a yang file with typedef and grouping sharing the same name, no warning is produced and only the code for typedef is generated.

example yang file content:

typedef network-topology-ref

{ type instance-identifier; ... }

grouping network-topology-ref {
leaf network-topology-ref

{ type network-topology-ref; mandatory true; ... }

}

The generated code for this yang contains only one class named NetworkTopologyRef for the typedef.

A warning about this would be welcomed.