[GHC] #14775: GHC 8.4.1-alpha3 regression: Build error when `build-type: Custom` and `license: OtherLicense` are in the .cabal file

[GHC]

#14775: GHC 8.4.1-alpha3 regression: Build error when `build-type: Custom` and
`license: OtherLicense` are in the .cabal file
-------------------------------------+-------------------------------------
        Reporter:  asr               |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.4.1-alpha3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Description changed by asr:

Old description:

> I'm getting the following error when `build-type: Custom` and `license:
> OtherLicense` are in the .cabal file:
>
> `Foo.cabal`:
> {{{
> name:                Foo
> version:             0.1.0.0
> license:             OtherLicense
> build-type:          Custom
> cabal-version:       >=1.10
>
> library
>   exposed-modules:     Foo
>   build-depends:       base
>   default-language:    Haskell2010
> }}}
>
> `Foo.hs`:
> {{{#!hs
> module Foo where
>
> foo :: Int -> Int
> foo n = n
> }}}
>
> `Setup.hs`:
> {{{#!hs
> import Distribution.Simple
> main = defaultMain
> }}}
>
> The error:
> {{{
> $ cabal install
> Failed to install Foo-0.1.0.0
> cabal: Error: some packages failed to install:
> Foo-0.1.0.0-33ReQaKfqaD7MoDL7J5kFM failed during the final install step.
> The
> exception was:
> dieVerbatim: user error (cabal: Couldn't parse the output of 'setup
> register
> --gen-pkg-config':NoParse
> "license" 5
> )
> }}}
>
> `cabal-install` version:
> {{{
> $ cabal --version
> cabal-install version 2.0.0.1
> compiled using version 2.0.1.0 of the Cabal library
> }}}
>
> If I change the `license` field ''or'' the `build` field, the error
> disappeared. I didn't get the above error using GHC 8.4.1-alpha2.

New description:

 I got an error installing Agda upstream. I could reduce the error when
 `build-type: Custom` and `license: OtherLicense` are in the .cabal file:

 `Foo.cabal`:
 {{{
 name:                Foo
 version:             0.1.0.0
 license:             OtherLicense
 build-type:          Custom
 cabal-version:       >=1.10

 library
   exposed-modules:     Foo
   build-depends:       base
   default-language:    Haskell2010
 }}}

 `Foo.hs`:
 {{{#!hs
 module Foo where

 foo :: Int -> Int
 foo n = n
 }}}

 `Setup.hs`:
 {{{#!hs
 import Distribution.Simple
 main = defaultMain
 }}}

 The error:
 {{{
 $ cabal install
 Failed to install Foo-0.1.0.0
 cabal: Error: some packages failed to install:
 Foo-0.1.0.0-33ReQaKfqaD7MoDL7J5kFM failed during the final install step.
 The
 exception was:
 dieVerbatim: user error (cabal: Couldn't parse the output of 'setup
 register
 --gen-pkg-config':NoParse
 "license" 5
 )
 }}}

 `cabal-install` version:
 {{{
 $ cabal --version
 cabal-install version 2.0.0.1
 compiled using version 2.0.1.0 of the Cabal library
 }}}

 If I change the `license` field ''or'' the `build` field, the error
 disappeared. I didn't get the above error using GHC 8.4.1-alpha2.

--

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14775#comment:2>
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