-ddump-splices prints out declarations in the wrong order
{-# 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
[d| deriving instance Eq B
deriving instance Eq A |]
instead of
[d| deriving instance Eq A
deriving instance Eq B |]
which is what I originally wrote.
Trac metadata
Trac field | Value |
---|---|
Version | 8.0.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Template Haskell |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |