add tests for self referencing types with StructRef
add tests for self referencing types with StructRef

cpcloud/numba,gmarkall/numba,IntelLabs/numba,seibert/numba,stonebig/numba,stuartarchibald/numba,seibert/numba,seibert/numba,cpcloud/numba,gmarkall/numba,stonebig/numba,stonebig/numba,numba/numba,stonebig/numba,cpcloud/numba,IntelLabs/numba,IntelLabs/numba,seibert/numba,stuartarchibald/numba,numba/numba,numba/numba,stuartarchibald/numba,gmarkall/numba,stonebig/numba,numba/numba,gmarkall/numba,cpcloud/numba,numba/numba,cpcloud/numba,stuartarchibald/numba,stuartarchibald/numba,IntelLabs/numba,seibert/numba,IntelLabs/numba,gmarkall/numba