[GHC] #15106: Explore using pure unifier instead of monadic one

[GHC]

#15106: Explore using pure unifier instead of monadic one
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        Reporter:  goldfire          |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 > Simon and I hit upon a radical idea this morning: what if eager
 unification simply called the pure unifier?

 One problem with this: we'd need to zonk, and then call the pure unifier;
 two passes, which seems sub-optimal.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15106#comment:1>
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