[GHC] #15502: -ddump-splices truncates Integer literals to Int literals

[GHC]

#15502: -ddump-splices truncates Integer literals to Int literals
-------------------------------------+-------------------------------------
           Reporter:  ChaiTRex       |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          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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 I trusted that the splice results shown by `-ddump-splices` were correct.
 They weren't, which caused me to waste a lot of time debugging my Template
 Haskell expressions when they were already correct.

 {{{
 $ ghc --version
 The Glorious Glasgow Haskell Compilation System, version 8.4.3
 }}}

 == Example program ==

 {{{#!hs
 {-# OPTIONS_GHC -ddump-splices #-}
 {-# LANGUAGE TemplateHaskell #-}

 module Main where

 import Language.Haskell.TH.Syntax  (Lift(lift))

 main = print ( $( lift (toInteger (maxBound :: Int) + 1) )
              , $( lift (minBound :: Int) )
              )
 }}}

 == Output of `runghc` ==

 Note that the output of the program on the bottom line below is correct.
 The two splice results shown by `-ddump-splices` incorrectly match each
 other:

 {{{
 Example.hs:8:19-56: Splicing expression
     lift (toInteger (maxBound :: Int) + 1) ======> -9223372036854775808
 Example.hs:9:19-40: Splicing expression
     lift (minBound :: Int) ======> (-9223372036854775808)
 (9223372036854775808,-9223372036854775808)
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15502>
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