The build is unreachable.

Build log

> /tmp/stackage-build2452$ stack unpack haskell-src-exts-1.20.3@sha256:eb9a0a02e422f64e793fe077e445e930bc365b7f7ce92ce6983475c72f8b3785
Unpacked haskell-src-exts-1.20.3 to /tmp/stackage-build2452/haskell-src-exts-1.20.3/
> /tmp/stackage-build2452/haskell-src-exts-1.20.3$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
[1 of 1] Compiling Main             ( Setup.hs, Setup.o )
Linking Setup ...
> /tmp/stackage-build2452/haskell-src-exts-1.20.3$ ./Setup configure --package-db=clear --package-db=global --package-db=/home/circleci/project/builds/nightly/pkgdb --libdir=/home/circleci/project/builds/nightly/lib --bindir=/home/circleci/project/builds/nightly/bin --datadir=/home/circleci/project/builds/nightly/share --libexecdir=/home/circleci/project/builds/nightly/libexec --sysconfdir=/home/circleci/project/builds/nightly/etc --docdir=/home/circleci/project/builds/nightly/doc/haskell-src-exts-1.20.3 --htmldir=/home/circleci/project/builds/nightly/doc/haskell-src-exts-1.20.3 --haddockdir=/home/circleci/project/builds/nightly/doc/haskell-src-exts-1.20.3
Configuring haskell-src-exts-1.20.3...
> /tmp/stackage-build2452/haskell-src-exts-1.20.3$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/haskell-src-exts-1.20.3$ ./Setup build
Preprocessing library for haskell-src-exts-1.20.3..
Building library for haskell-src-exts-1.20.3..
[ 1 of 18] Compiling Language.Haskell.Exts.Extension ( src/Language/Haskell/Exts/Extension.hs, dist/build/Language/Haskell/Exts/Extension.o )
[ 2 of 18] Compiling Language.Haskell.Exts.ExtScheme ( src/Language/Haskell/Exts/ExtScheme.hs, dist/build/Language/Haskell/Exts/ExtScheme.o )
[ 3 of 18] Compiling Language.Haskell.Exts.SrcLoc ( src/Language/Haskell/Exts/SrcLoc.hs, dist/build/Language/Haskell/Exts/SrcLoc.o )
[ 4 of 18] Compiling Language.Haskell.Exts.Syntax ( src/Language/Haskell/Exts/Syntax.hs, dist/build/Language/Haskell/Exts/Syntax.o )
[ 5 of 18] Compiling Language.Haskell.Exts.ParseSyntax ( src/Language/Haskell/Exts/ParseSyntax.hs, dist/build/Language/Haskell/Exts/ParseSyntax.o )
[ 6 of 18] Compiling Language.Haskell.Exts.Pretty ( src/Language/Haskell/Exts/Pretty.hs, dist/build/Language/Haskell/Exts/Pretty.o )
[ 7 of 18] Compiling Language.Haskell.Exts.Fixity ( src/Language/Haskell/Exts/Fixity.hs, dist/build/Language/Haskell/Exts/Fixity.o )
[ 8 of 18] Compiling Language.Haskell.Exts.Comments ( src/Language/Haskell/Exts/Comments.hs, dist/build/Language/Haskell/Exts/Comments.o )
[ 9 of 18] Compiling Language.Haskell.Exts.ParseMonad ( src/Language/Haskell/Exts/ParseMonad.hs, dist/build/Language/Haskell/Exts/ParseMonad.o )
[10 of 18] Compiling Language.Haskell.Exts.ParseUtils ( src/Language/Haskell/Exts/ParseUtils.hs, dist/build/Language/Haskell/Exts/ParseUtils.o )
[11 of 18] Compiling Language.Haskell.Exts.InternalLexer ( src/Language/Haskell/Exts/InternalLexer.hs, dist/build/Language/Haskell/Exts/InternalLexer.o )
[12 of 18] Compiling Language.Haskell.Exts.Lexer ( src/Language/Haskell/Exts/Lexer.hs, dist/build/Language/Haskell/Exts/Lexer.o )
[13 of 18] Compiling Language.Haskell.Exts.InternalParser ( dist/build/Language/Haskell/Exts/InternalParser.hs, dist/build/Language/Haskell/Exts/InternalParser.o )
[14 of 18] Compiling Language.Haskell.Exts.Parser ( src/Language/Haskell/Exts/Parser.hs, dist/build/Language/Haskell/Exts/Parser.o )
[15 of 18] Compiling Language.Haskell.Exts.ExactPrint ( src/Language/Haskell/Exts/ExactPrint.hs, dist/build/Language/Haskell/Exts/ExactPrint.o )
[16 of 18] Compiling Language.Haskell.Exts.Build ( src/Language/Haskell/Exts/Build.hs, dist/build/Language/Haskell/Exts/Build.o )
[17 of 18] Compiling Language.Preprocessor.Unlit ( src/Language/Preprocessor/Unlit.hs, dist/build/Language/Preprocessor/Unlit.o )

src/Language/Preprocessor/Unlit.hs:17:25: warning: [-Wname-shadowing]
    This binding for ‘x’ shadows the existing binding
      bound at src/Language/Preprocessor/Unlit.hs:14:17
   |
17 |          allProg (('\\':x):xs) |  "end{code}"`isPrefixOf`x = Blank : classify xs
   |                         ^

src/Language/Preprocessor/Unlit.hs:17:28: warning: [-Wname-shadowing]
    This binding for ‘xs’ shadows the existing binding
      bound at src/Language/Preprocessor/Unlit.hs:14:20
   |
17 |          allProg (('\\':x):xs) |  "end{code}"`isPrefixOf`x = Blank : classify xs
   |                            ^^

src/Language/Preprocessor/Unlit.hs:18:19: warning: [-Wname-shadowing]
    This binding for ‘x’ shadows the existing binding
      bound at src/Language/Preprocessor/Unlit.hs:14:17
   |
18 |          allProg (x:xs) = Program x:allProg xs
   |                   ^

src/Language/Preprocessor/Unlit.hs:18:21: warning: [-Wname-shadowing]
    This binding for ‘xs’ shadows the existing binding
      bound at src/Language/Preprocessor/Unlit.hs:14:20
   |
18 |          allProg (x:xs) = Program x:allProg xs
   |                     ^^

src/Language/Preprocessor/Unlit.hs:27:11: warning: [-Wunused-matches]
    Defined but not used: ‘x’
   |
27 | classify (x:xs)                 = Comment:classify xs
   |           ^

src/Language/Preprocessor/Unlit.hs:46:17: warning: [-Wunused-matches]
    Defined but not used: ‘y’
   |
46 | adjacent file n y@(Program _) (x@Comment      :xs) = error (message file n "program" "comment")
   |                 ^

src/Language/Preprocessor/Unlit.hs:46:32: warning: [-Wunused-matches]
    Defined but not used: ‘x’
   |
46 | adjacent file n y@(Program _) (x@Comment      :xs) = error (message file n "program" "comment")
   |                                ^

src/Language/Preprocessor/Unlit.hs:46:48: warning: [-Wunused-matches]
    Defined but not used: ‘xs’
   |
46 | adjacent file n y@(Program _) (x@Comment      :xs) = error (message file n "program" "comment")
   |                                                ^^

src/Language/Preprocessor/Unlit.hs:47:10: warning: [-Wunused-matches]
    Defined but not used: ‘file’
   |
47 | adjacent file n y@(Program _) (x@(Include i f):xs) = x: adjacent f    i     y xs
   |          ^^^^

src/Language/Preprocessor/Unlit.hs:47:15: warning: [-Wunused-matches]
    Defined but not used: ‘n’
   |
47 | adjacent file n y@(Program _) (x@(Include i f):xs) = x: adjacent f    i     y xs
   |               ^

src/Language/Preprocessor/Unlit.hs:49:17: warning: [-Wunused-matches]
    Defined but not used: ‘y’
   |
49 | adjacent file n y@Comment     (x@(Program _)  :xs) = error (message file n "comment" "program")
   |                 ^

src/Language/Preprocessor/Unlit.hs:49:32: warning: [-Wunused-matches]
    Defined but not used: ‘x’
   |
49 | adjacent file n y@Comment     (x@(Program _)  :xs) = error (message file n "comment" "program")
   |                                ^

src/Language/Preprocessor/Unlit.hs:49:48: warning: [-Wunused-matches]
    Defined but not used: ‘xs’
   |
49 | adjacent file n y@Comment     (x@(Program _)  :xs) = error (message file n "comment" "program")
   |                                                ^^

src/Language/Preprocessor/Unlit.hs:50:10: warning: [-Wunused-matches]
    Defined but not used: ‘file’
   |
50 | adjacent file n y@Comment     (x@(Include i f):xs) = x: adjacent f    i     y xs
   |          ^^^^

src/Language/Preprocessor/Unlit.hs:50:15: warning: [-Wunused-matches]
    Defined but not used: ‘n’
   |
50 | adjacent file n y@Comment     (x@(Include i f):xs) = x: adjacent f    i     y xs
   |               ^

src/Language/Preprocessor/Unlit.hs:52:10: warning: [-Wunused-matches]
    Defined but not used: ‘file’
   |
52 | adjacent file n y@Blank       (x@(Include i f):xs) = x: adjacent f    i     y xs
   |          ^^^^

src/Language/Preprocessor/Unlit.hs:52:15: warning: [-Wunused-matches]
    Defined but not used: ‘n’
   |
52 | adjacent file n y@Blank       (x@(Include i f):xs) = x: adjacent f    i     y xs
   |               ^

src/Language/Preprocessor/Unlit.hs:54:34: warning: [-Wunused-matches]
    Defined but not used: ‘next’
   |
54 | adjacent file n _             (x@next         :xs) = x: adjacent file (n+1) x xs
   |                                  ^^^^

src/Language/Preprocessor/Unlit.hs:55:10: warning: [-Wunused-matches]
    Defined but not used: ‘file’
   |
55 | adjacent file n _             []                   = []
   |          ^^^^

src/Language/Preprocessor/Unlit.hs:55:15: warning: [-Wunused-matches]
    Defined but not used: ‘n’
   |
55 | adjacent file n _             []                   = []
   |               ^

src/Language/Preprocessor/Unlit.hs:69:22: warning: [-Wname-shadowing]
    This binding for ‘s’ shadows the existing binding
      bound at src/Language/Preprocessor/Unlit.hs:66:9
   |
69 |   lines' ('\^M':'\n':s) acc = acc [] : lines' s id      -- DOS
   |                      ^

src/Language/Preprocessor/Unlit.hs:70:17: warning: [-Wname-shadowing]
    This binding for ‘s’ shadows the existing binding
      bound at src/Language/Preprocessor/Unlit.hs:66:9
   |
70 |   lines' ('\^M':s)      acc = acc [] : lines' s id      -- MacOS
   |                 ^

src/Language/Preprocessor/Unlit.hs:71:16: warning: [-Wname-shadowing]
    This binding for ‘s’ shadows the existing binding
      bound at src/Language/Preprocessor/Unlit.hs:66:9
   |
71 |   lines' ('\n':s)       acc = acc [] : lines' s id      -- Unix
   |                ^

src/Language/Preprocessor/Unlit.hs:72:13: warning: [-Wname-shadowing]
    This binding for ‘s’ shadows the existing binding
      bound at src/Language/Preprocessor/Unlit.hs:66:9
   |
72 |   lines' (c:s)          acc = lines' s (acc . (c:))
   |             ^
[18 of 18] Compiling Language.Haskell.Exts ( src/Language/Haskell/Exts.hs, dist/build/Language/Haskell/Exts.o )
> /tmp/stackage-build2452/haskell-src-exts-1.20.3$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/haskell-src-exts-1.20.3$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181113/haskell-src-exts-1.20.3-HNMLB3GgsF7I1BH2g0YWHz
> /tmp/stackage-build2452/haskell-src-exts-1.20.3$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/haskell-src-exts-1.20.3$ ./Setup register
Registering library for haskell-src-exts-1.20.3..