[GHC] #15373: core-spec.pdf contains parse errors

[GHC]

#15373: core-spec.pdf contains parse errors
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           Reporter:  RyanGlScott    |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.8.1
          Component:  Compiler       |           Version:  8.4.3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 After commit 2fbe0b5171fd5639845b630faccb9a0c3b564df7, `core-spec.pdf` now
 contains several gnarly looking parse errors (which I'll attach
 screenshots of separately). This is because `nth` coercion typing rule was
 extended to take a role as an argument, but the uses of `nth` in the
 `S_Push`, `S_CPush`, and `S_CasePush` rules were never updated to reflect
 this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15373>
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