[GHC] #10279: panic on haskell-src-exts

[GHC]

#10279: panic on haskell-src-exts
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        Reporter:  throwaway123      |                   Owner:  ezyang
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Linux             |            Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash                              |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by ezyang):

 Here is an easy new error message we can do:

 {{{
 testsuite/tests/th/T10279.hs:5:10: error:
     Failed to load interface for ‘A’
     no package key matching ‘base-4.8.1.0’ was found
     (This package key looks like the source package ID;
      the real package key is ‘base’)
     In the expression: (base-4.8.1.0:A.Foo)
     In an equation for ‘blah’: blah = (base-4.8.1.0:A.Foo)
 }}}

 but I think a better plan is to update `cvtName` in `hsSyn/Convert.hs` to
 validate modules in `flavour`. (But maybe we want to update the error
 message here anyway.)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10279#comment:8>
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