| >   Eta-expand some higher-rank functions.  GHC is about to
| >   move to *invariant* rather than *contra-variant* in function
| >   arguments, so far as type subsumption is concerned. These
| >   eta-expansions are simple, and allow type inference to
| >   go through with invariance.
| 
| Why drop contra-variace?

See the paper on "Boxy type inference" on my home page.

Simon
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