[GHC] #15841: User's Guide section for Coercible links to a 404 page

[GHC]

#15841: User's Guide section for Coercible links to a 404 page
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           Reporter:  koz_           |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Documentation  |           Version:  8.6.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Documentation
  Unknown/Multiple                   |  bug
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Section 10.14.4 of the User's Guide is meant to describe the Coercible
 constraint, and links to the safe coercions paper to do so (there's
 basically little else in that section at all). However, that link
 currently 404s (the link is specifically
 http://www.cis.upenn.edu/~eir/papers/2014/coercible/coercible.pdf).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15841>
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