[GHC] #14811: Unary unboxed tuple field causes panic

14 Feb 2018


      #14811: Unary unboxed tuple field causes panic
-------------------------------------+-------------------------------------
           Reporter:  dfeuer         |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  high           |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.2.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Compile-time
  Unknown/Multiple                   |  crash or panic
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Compiling this code under 8.2 or HEAD (but not 8.0), I get an error.

 {{{#!hs
 {-# language UnboxedTuples #-}
 module Reccy where

 data Foo a = Foo (# a #)
 }}}

 {{{
 Reccy.hs:1:1: error:
     Can't find interface-file declaration for variable GHC.Types.$tcUnit#
       Probable cause: bug in .hi-boot file, or inconsistent .hi file
       Use -ddump-if-trace to get an idea of which file caused the error
   |
 1 | -- {-# language GADTs, TypeOperators #-}
   | ^
 }}}

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Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14811
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