[GHC] #13799: -ddump-splices prints out declarations in the wrong order

7 Jun 2017

      #13799: -ddump-splices prints out declarations in the wrong order
-------------------------------------+-------------------------------------
           Reporter:  RyanGlScott    |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Template       |           Version:  8.0.1
  Haskell                            |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Debugging
  Unknown/Multiple                   |  information is incorrect
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 {{{#!hs
 {-# LANGUAGE StandaloneDeriving #-}
 {-# LANGUAGE TemplateHaskell #-}
 {-# OPTIONS_GHC -ddump-splices #-}
 module Bug where

 $([d| data A = A
       data B = B
     |])

 $([d| deriving instance Eq A
       deriving instance Eq B
     |])
 }}}

 {{{
 GHCi, version 8.0.2: http://www.haskell.org/ghc/  :? for help
 Loaded GHCi configuration from /home/rgscott/.ghci
 [1 of 1] Compiling Bug              ( Bug.hs, interpreted )
 Bug.hs:(6,3)-(8,6): Splicing declarations
     [d| data A_a13D = A_a13E
         data B_a13B = B_a13C |]
   ======>
     data A_a3IA = A_a3IB
     data B_a3IC = B_a3ID
 Bug.hs:(10,3)-(12,6): Splicing declarations
     [d| deriving instance Eq B
         deriving instance Eq A |]
   ======>
     deriving instance Eq A
     deriving instance Eq B
 }}}

 Notice that it printed

 {{{#!hs
     [d| deriving instance Eq B
         deriving instance Eq A |]
 }}}

 instead of

 {{{#!hs
     [d| deriving instance Eq A
         deriving instance Eq B |]
 }}}

 which is what I originally wrote.

--
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13799
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler