rank2classes testsuite fails (#3122)
rank2classes testsuite fails (#3122)

> /tmp/stackage-build12/rank2classes-1.0$ dist/build/doctests/doctests
<no location info>: error: can't find file: test/README.lhs

massysett/stackage,lwm/stackage,mgajda/stackage,athanclark/stackage,soenkehahn/stackage,creichert/stackage,mstksg/stackage,ethercrow/stackage,k0ral/stackage,wereHamster/stackage,peti/stackage,jonschoning/stackage,spencerjanssen/stackage,Daniel-Diaz/stackage,iand675/stackage,asr/stackage,Shimuuar/stackage,mrkkrp/stackage,michalkonecny/stackage,simonmichael/stackage,stackbuilders/stackage,phaazon/stackage,clinty/stackage,int-index/stackage,fimad/stackage,garetxe/stackage,fpco/stackage