[GHC] #10838: hsig files don't have good enough error checking for wired-in types

3 Sep 2015

      #10838: hsig files don't have good enough error checking for wired-in types
-------------------------------------+-------------------------------------
              Reporter:  ezyang      |             Owner:  ezyang
                  Type:  bug         |            Status:  new
              Priority:  normal      |         Milestone:
             Component:  Compiler    |           Version:  7.11
  (Type checker)                     |
              Keywords:  backpack    |  Operating System:  Unknown/Multiple
          Architecture:              |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
             Test Case:              |        Blocked By:
              Blocking:              |   Related Tickets:
Differential Revisions:              |
-------------------------------------+-------------------------------------
 If I have the signature:

 {{{
 {-# LANGUAGE NoImplicitPrelude #-}
 module MyPrelude where
 data Int a
 }}}

 And I compile it with `ghc MyPrelude.hsig -sig-of "MyPrelude is
 base:Prelude"` this won't actually give an error, despite `Int` having the
 wrong kind.

 The bug seems to be because `Int` is wired in and this case is not
 handled.

 Filing this so I don't forget to fix.

--
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10838
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler