Switch to lts-15.13.

Previously we were building against a release candidate for ghc-8.8.
Now, we can just use a Stack LTS.

Also update the default in `stack.yaml`.

.circleci/config.yml

@@ -50,19 +50,19 @@ jobs:
                 - ~/.stack
                 - .stack-work
 
-  build-ghc-8.8:
+  build-15.13:
     docker:
     - image: circleci/rust:1.36-stretch
     steps:
     - checkout
     - restore_cache:
         keys:
-            - stack-cache-v2-ghc-8.8-{{ arch }}-{{ .Branch }}
-            - stack-cache-v2-ghc-8.8-{{ arch }}-master
+            - stack-cache-v2-ghc-15.13-{{ arch }}-{{ .Branch }}
+            - stack-cache-v2-ghc-15.13-{{ arch }}-master
     - run: .circleci/install-stack.sh
-    - run: stack test --no-terminal --stack-yaml=stack-8.8.yaml
+    - run: stack test --no-terminal --resolver=lts-15.13
     - save_cache:
-            key: stack-cache-v2-ghc-8.8-{{ arch }}-{{ .Branch }}-{{ epoch }}
+            key: stack-cache-v2-ghc-15.13-{{ arch }}-{{ .Branch }}-{{ epoch }}
             paths:
                 - ~/.stack
                 - .stack-work
@@ -80,10 +80,10 @@ workflows:
         - build-11.22
         - build-12.8
         - build-13.23
-        - build-ghc-8.8
+        - build-15.13
         - build-success:
             requires:
             - build-11.22
             - build-12.8
             - build-13.23
-            - build-ghc-8.8
+            - build-15.13

stack-8.8.yaml

@@ -1,55 +0,0 @@
-# Copyright 2019 Google LLC
-#
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file or at
-# https://developers.google.com/open-source/licenses/bsd
-
-resolver: ghc-8.8.0.20190613
-packages:
-- .
-- ghc-show-ast
-
-setup-info:
-  ghc:
-    macosx:
-        8.8.0.20190613:
-            url: "https://downloads.haskell.org/~ghc/8.8.1-alpha2/ghc-8.8.0.20190613-x86_64-apple-darwin.tar.xz"
-            content-length: 184846152
-            sha1: 116bdaadcde045f78adcf1ffce291c79fb1c3eb6
-            sha256: 04b5b4dc35db2bc26f5e4d46946409a5d21f47a7923bf69ee31b093b7e71e889
-    linux64:
-        8.8.0.20190613:
-            url: "https://downloads.haskell.org/~ghc/8.8.1-alpha2/ghc-8.8.0.20190613-x86_64-deb9-linux.tar.xz"
-            content-length: 199898532
-            sha1: 11360a17f61da02c82d0f64f07e124479cedecc4
-            sha256: ff532d0b700fcd9c5343a942eab35450cd9d70ce5c5064ca4dfe7af94b05616e
-
-allow-newer: true
-compiler: ghc-8.8.0.20190613
-
-extra-deps:
-- git: https://github.com/pcapriotti/optparse-applicative.git
-  commit: 83e096aa20cd4fd5328bf11c266115326d584e00
-# For compatibility with newer Cabal:
-- git: https://github.com/simonmar/ghc-paths.git
-  commit: 3c867c34b6f505a500cc63bba5161b97aa0a9177
-- ansi-wl-pprint-0.6.9@sha256:0b225cd1dc7afc3d73e428f7c0473a176adeeb8b9584a74379211832cd492689,2364
-- colour-2.3.5@sha256:b27db0a3ad40d70bdbd8510a104269f8707592e80757a1abc66a22ba25e5a42f,1801
-- hashable-1.3.0.0@sha256:7ad8edaa681e81162ddddb4d703a9cffe6a0c9ddcfede31cf6569507ed3f1ddb,5179
-- transformers-compat-0.6.5@sha256:50b00c57bf3fc379ec2477bfc261a2aebc983084488478adb29854f193af4696,5490
-- ansi-terminal-0.9.1@sha256:48f53532d0f365ffa568c8cf0adc84c66f800a7d80d3329e4f04fa75392f4af1,3225
-- async-2.2.2@sha256:ed46f0f5be36cf8a3e3aebc6827d015e1f3bf9615c245e057b9e9bd35faddd21,2895
-- call-stack-0.1.0@sha256:3453a0c5ed3a7a7de0cc0703907e05bd251c766cce8a38efe41b7188d228e3fa,1109
-- clock-0.8@sha256:b4ae207e2d3761450060a0d0feb873269233898039c76fceef9cc1a544067767,4113
-- tagged-0.8.6@sha256:7093ee39c9779beeacffa4b0035a0e8a25da16afcd1c1a876930207fb8e31d1c,2606
-- unbounded-delays-0.1.1.0@sha256:8e57c6ffb72ed605b85c69d3b3a7ebbbbb70bfb5e9b9816309f1f733240838f2,1184
-- wcwidth-0.0.2@sha256:77531eb6683c505c22ab3fa11bbc43d3ce1e7dac21401d4d5a19677d348bb5f3,1998
-- tasty-1.2.3@sha256:bba67074e5326d57e8f53fc1dabcb6841daa4dc51b053506eb7f40a6f49a0497,2517
-- tasty-hunit-0.10.0.2@sha256:8e8bd5807cec650f5aebc5ada07b57620c863e69145e65249651c1b48d97bd70,1515
-- tasty-quickcheck-0.10.1@sha256:9a6cbb4767c7b339a399e3992afb89f112a92ffdc8101e318ba1a3bb05bc48d7,1555
-- QuickCheck-2.13.2@sha256:ad4e5adbd1c9dc0221a44307b992cb040c515f31095182e47aa7e974bc461df1,6952
-- random-1.1@sha256:7b67624fd76ddf97c206de0801dc7e888097e9d572974be9b9ea6551d76965df,1777
-- splitmix-0.0.2@sha256:e1c4d1202757d63cd4b4498d5fa600a792f2a315d2fdc6cf772f4679113c1819,3298
-
-ghc-options:
-  "$locals": -Wall -Werror

stack.yaml

@@ -4,7 +4,7 @@
 # license that can be found in the LICENSE file or at
 # https://developers.google.com/open-source/licenses/bsd
 
-resolver: lts-13.23
+resolver: lts-15.13
 packages:
 - .
 - ghc-show-ast