I made some strictifying changes and started getting this msg from ghc:
match_co: needs more cases
vector-0.10.0.1:Data.Vector.Generic.Mutable.MVector{tc r46}
(Sym <(vector-0.10.0.1:Data.Vector.TFCo:R:MutableVector{tc r45})>)
<main:Util.TimeVectorStorable.Sample{tc r4e} y{tv a4lK} [tv]>
It's not just TimeVectorStorable.Sample (which is indeed stored in
Data.Vectors), we also have some mysterious compiler-generated
symbols:
match_co: needs more cases
vector-0.10.0.1:Data.Vector.Generic.Mutable.MVector{tc rQA}
(Sym <(vector-0.10.0.1:Data.Vector.TFCo:R:MutableVector{tc rQz})>)
<a{tv a6IH} [tv]>
I assume this is harmless, but I didn't see any other references to
this error on the web or on the ghc trac so maybe it's new?
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