Opened 7 years ago

Closed 7 years ago

Last modified 6 years ago

#2449 closed bug (fixed)

panic with GeneralizedNewtypeDeriving and a .hs-boot file

Reported by: igloo Owned by: igloo
Priority: normal Milestone: 6.10.1
Component: Compiler Version: 6.9
Keywords: Cc:
Operating System: Unknown/Multiple Architecture: Unknown/Multiple
Type of failure: Test Case: drvfail016
Blocked By: Blocking:
Related Tickets: Differential Revisions:

Description

With A.hs-boot:

module A where

data A
    deriving Show

We can get a panic:

$ ghc -c -XGeneralizedNewtypeDeriving A.hs-boot

A.hs-boot:5:13:ghc: panic! (the 'impossible' happened)
  (GHC version 6.9.20080716 for x86_64-unknown-linux):
        newTyConEtadRhs main:A.A{tc r6K}

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

Change History (4)

comment:1 Changed 7 years ago by simonpj

  • Owner set to igloo

Good bug. As the user manual says, you can't put deriving clauses in hs-boot files. I've made GHC check properly for this now.

Tue Aug  5 11:54:02 BST 2008  [email protected]
  * Fix Trac #2449
  
  Deriving isn't allowed in hs-boot files (says the user manual)
  This patch checks properly instead of crashing!

IAN: I'm not sure how to add a test case whose source file is a hs-boot file. Could you do so please? The one above will do fine. Thanks. Then close.

Simon

comment:2 Changed 7 years ago by igloo

  • Resolution set to fixed
  • Status changed from new to closed
  • Test Case set to drvfail016

Test drvfail016 added

comment:3 Changed 6 years ago by simonmar

  • Architecture changed from Unknown to Unknown/Multiple

comment:4 Changed 6 years ago by simonmar

  • Operating System changed from Unknown to Unknown/Multiple
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