-ddump-splices pretty-prints LambdaCase nonsensically
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE TemplateHaskell #-}
{-# OPTIONS_GHC -ddump-splices #-}
module Bug where
$([d| f :: Bool -> ()
f = \case True -> ()
False -> ()
|])
$ /opt/ghc/8.4.3/bin/ghci Bug.hs
GHCi, version 8.4.3: http://www.haskell.org/ghc/ :? for help
Loaded GHCi configuration from /home/ryanglscott/.ghci
[1 of 1] Compiling Bug ( Bug.hs, interpreted )
Bug.hs:(6,3)-(9,6): Splicing declarations
[d| f_a1xr :: Bool -> ()
f_a1xr
= \case
True -> ()
False -> () |]
======>
f_a48E :: Bool -> ()
f_a48E
= \case
\ True -> GHC.Tuple.()
\ False -> GHC.Tuple.()
Ok, one module loaded.
Notice the use of \ True
and \ False
. Those patterns should not be preceded with backslashes.
Trac metadata
Trac field | Value |
---|---|
Version | 8.4.3 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Template Haskell |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |