Test against stack-nightly. (#27)

* Relax base dependency.

* Disable diagrams.

* Remove unused dependencies.

* Use new version of chiphunk.

* Fix imports.

* Workaround for warnings in newer versions of ghc.

* Don't be pedantic during the nightly test.

Former-commit-id: 76e3f3c4568e8a340014622260a6c5e84224d67b

.azure/azure-linux-template.yml

@@ -9,13 +9,18 @@ jobs:
       stack:
         BUILD: stack
         STACK_YAML: stack.yaml
-        ARGS: --resolver lts-13.14
+        ARGS: --pedantic
       stack-lts-12:
         BUILD: stack
         STACK_YAML: stack-lts-12.yaml
+        ARGS: --pedantic
       stack-lts-11:
         BUILD: stack
         STACK_YAML: stack-lts-11.yaml
+        ARGS: --pedantic
+      stack-nightly:
+        BUILD: stack
+        ARGS: --resolver nightly
     maxParallel: 6
   steps:
   - task: CacheBeta@0
@@ -104,7 +109,7 @@ jobs:
           ;;
         *)
           stack ./examples/counter.hs check
-          stack $ARGS test --pedantic
+          stack test $ARGS
           ;;
       esac
       set +ex