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  • #8841

Closed
Open
Opened Mar 03, 2014 by Icelandjack@IcelandjackReporter

PatternSynonyms error gives wrong source locations

Using an example from the GHC user's guide but omitting the argument to Maybe

{-# LANGUAGE PatternSynonyms #-}

data Type = App String [Type]

pattern Maybe = App "Maybe" [t]

gives the following error without the correct source locations

ghci> :load /tmp/failure.hs 
[1 of 1] Compiling Main             ( /tmp/failure.hs, interpreted )

/tmp/failure.hs:1:1:
    Right-hand side of bidirectional pattern synonym cannot be used as an expression
      App "Maybe" [t]
Failed, modules loaded: none.
Trac metadata
Trac field Value
Version 7.8.1-rc2
Type Bug
TypeOfFailure OtherFailure
Priority low
Resolution Unresolved
Component Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture
Assignee
Assign to
7.8.1
Milestone
7.8.1 (Past due)
Assign milestone
Time tracking
None
Due date
None
Reference: ghc/ghc#8841