leave off the "| r" in pureST #1
Merged
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Per discussion with paf31 in #purescript. This was written the old way to follow the lead of runPure, but now that we have empty row syntax runPure doesn't have to be written that way (see purescript-deprecated/purescript-eff#7) so let's write this type a bit more clearly.
I can't say I have a completely solid grasp on rank-n types or Eff/row types so I'm not certifying the correctness of this, just pushing the buttons based on my understanding of what was discussed in #purescript.