Run all of the dhall package's tests on Appveyor. (#1142)

This entails a bunch of surgery to the package set used with LTS 6.
Because I was seeing errors, I disabled allow-newer and found this
consistent package set. I also needed a newer version of `tls`, which
entailed a bunch of bumps.

appveyor.yml

@@ -12,6 +12,7 @@ environment:
   # Override the temp directory to avoid sed escaping issues
   # See https://github.com/haskell/cabal/issues/5386
   TMP: c:\tmp
+  LANG: en_US.UTF-8
 
   matrix:
     - STACK_YAML: stack.yaml
@@ -48,9 +49,9 @@ for:
     - 7z a "bin\dhall-bash-%DEPLOY_SUFFIX%" "%APPVEYOR_BUILD_FOLDER%\bin\dhall-to-bash.exe"
     - 7z a "bin\dhall-lsp-server-%DEPLOY_SUFFIX%" "%APPVEYOR_BUILD_FOLDER%\bin\dhall-lsp-server.exe"
 
-  # stack is not able to build test dependencies with lts-6
   test_script:
-    - stack test dhall:tasty
+    # chcp 65001 (utf-8) needed to make doctest work
+    - chcp 65001 && stack test dhall
     - stack test dhall-json
     - stack test dhall-bash
     # - stack test dhall-lsp-server # Disabled while the tests are broken.
@@ -71,6 +72,10 @@ for:
     - 7z a "bin\dhall-%DEPLOY_SUFFIX%" "%APPVEYOR_BUILD_FOLDER%\bin\dhall.exe"
     - 7z a "bin\dhall-bash-%DEPLOY_SUFFIX%" "%APPVEYOR_BUILD_FOLDER%\bin\dhall-to-bash.exe"
 
+  test_script:
+    # chcp 65001 (utf-8) needed to make doctest work
+    - chcp 65001 && stack test dhall
+
 artifacts:
   - path: bin\dhall-%DEPLOY_SUFFIX%
     name: dhall

dhall/tests/Dhall/Test/Dhall.hs

@@ -17,6 +17,7 @@ module Dhall.Test.Dhall where
 
 import Control.Exception (SomeException, try)
 import Data.Functor.Foldable.TH (makeBaseFunctor)
+import Data.Monoid ((<>))
 import Data.String (fromString)
 import Data.Text (Text)
 import Dhall (Inject, Interpret)

dhall/tests/Dhall/Test/Util.hs

@@ -25,6 +25,7 @@ import Data.Text (Text)
 import Dhall.Context (Context)
 import Dhall.Core (Expr, Normalizer, ReifiedNormalizer(..), Import)
 import Dhall.Import (Status)
+import Data.Monoid((<>))
 import Dhall.Parser (Src)
 import Dhall.TypeCheck (X)
 import Prelude hiding (FilePath)

stack-lts-6.yaml

@@ -3,7 +3,7 @@ packages:
   - dhall
   - dhall-bash
 extra-deps:
-- ansi-terminal-0.7.1.1
+- ansi-terminal-0.9.1
 - either-5
 - ansi-wl-pprint-0.6.8.2
 - cryptonite-0.24
@@ -17,13 +17,13 @@ extra-deps:
 - basement-0.0.6
 - prettyprinter-1.2.0.1
 - prettyprinter-ansi-terminal-1.1.1.2
-- directory-1.2.7.1
+- directory-1.3.4.0
 - foundation-0.0.19
 - process-1.6.2.0
 - repline-0.2.1.0
 - haskeline-0.7.4.2
-- aeson-1.2.3.0
-- th-abstraction-0.2.6.0
+- aeson-1.4.4.0
+- th-abstraction-0.3.1.0
 - cborg-0.2.1.0
 - serialise-0.2.1.0
 - shell-escape-0.2.0
@@ -31,7 +31,7 @@ extra-deps:
 - dotgen-0.4.2
 - aeson-pretty-0.8.7
 - transformers-compat-0.6.4
-- exceptions-0.10.1
+- exceptions-0.8.3
 - mmorph-1.1.3
 - monad-control-1.0.2.3
 - resourcet-1.1.11
@@ -39,6 +39,50 @@ extra-deps:
 - unliftio-core-0.1.2.0
 - yaml-0.10.4.0
 - recursion-schemes-5.1.3
+- cabal-doctest-1.0.6
+- QuickCheck-2.13.2
+- tasty-quickcheck-0.10.1
+- tasty-1.2.3
+- splitmix-0.0.2
+- semigroupoids-5.3.2
+- base-orphans-0.8.1
+- tagged-0.8.6
+- Cabal-2.4.1.0
+- parsec-3.1.13.0
+- text-1.2.3.1
+- profunctors-5.4
+- wcwidth-0.0.2
+- foldl-1.4.5
+- quickcheck-instances-0.3.22
+- base-compat-0.10.5
+- hashable-1.2.7.0
+- semigroups-0.18.5
+- time-compat-1.9.2.2
+- vector-builder-0.3.7.2
+- case-insensitive-1.2.1.0
+- scientific-0.3.6.2
+- unordered-containers-0.2.10.0
+- uuid-types-1.0.3
+- contravariant-1.5.2
+- dlist-0.8.0.6
+- primitive-0.6.3.0
+- vector-0.12.0.3
+- StateVar-1.2
+- integer-logarithms-1.0.3
+- attoparsec-0.13.2.2
+- tls-1.4.1
+- x509-1.7.5
+- x509-validation-1.6.11
+- x509-store-1.6.7
+- x509-system-1.6.6
+- mintty-0.1.2
+- Win32-2.6.2.0
+- unix-compat-0.5.1
+- system-fileio-0.3.16.4
+- time-1.8.0.4
+- th-lift-instances-0.1.13
+- th-lift-0.8.0.1
+- unix-2.7.2.2
 flags:
   transformers-compat:
     four: true
@@ -46,4 +90,3 @@ nix:
   packages:
     - ncurses
     - zlib
-allow-newer: true