GHC 8.8.4 & 8.10.2 (#751)

* GHC 8.8.4 & 8.10.2

* plugins test fixed on 8.10.2

* use GHC 8.10.1 on windows to workaround a bug

.azure/windows-stack.yml

@@ -6,7 +6,7 @@ jobs:
   strategy:
     matrix:
       stack_810:
-        STACK_YAML: "stack810.yaml"
+        STACK_YAML: "stack8101.yaml"
       stack_88:
         STACK_YAML: "stack88.yaml"
       stack_86:

stack810.yaml

@@ -1,4 +1,4 @@
-resolver: nightly-2020-06-19
+resolver: nightly-2020-09-02
 allow-newer: true
 packages:
 - .

stack8101.yaml

@@ -0,0 +1,32 @@
+resolver: nightly-2020-06-19
+allow-newer: true
+packages:
+- .
+extra-deps:
+- haskell-lsp-0.22.0.0
+- haskell-lsp-types-0.22.0.0
+- lsp-test-0.11.0.2
+- ghc-check-0.5.0.1
+- hie-bios-0.6.1
+
+# not yet in stackage
+- Chart-diagrams-1.9.3
+- SVGFonts-1.7.0.1
+- diagrams-1.4
+- diagrams-svg-1.4.3
+- diagrams-contrib-1.4.4
+- diagrams-core-1.4.2
+- diagrams-lib-1.4.3
+- diagrams-postscript-1.5
+- monoid-extras-0.5.1
+- svg-builder-0.1.1
+- active-0.2.0.14
+- dual-tree-0.2.2.1
+- force-layout-0.4.0.6
+- statestack-0.3
+
+nix:
+  packages: [zlib]
+
+ghc-options:
+  ghcide: -DSTACK

stack88.yaml

@@ -1,4 +1,4 @@
-resolver: nightly-2020-02-13
+resolver: lts-16.12
 packages:
 - .
 extra-deps:

test/exe/Main.hs

@@ -2234,8 +2234,7 @@ checkFileCompiles fp =
 
 
 pluginTests :: TestTree
-pluginTests = (`xfail8101` "known broken (#556)")
-            $ testSessionWait "plugins" $ do
+pluginTests = testSessionWait "plugins" $ do
   let content =
         T.unlines
           [ "{-# OPTIONS_GHC -fplugin GHC.TypeLits.KnownNat.Solver #-}"
@@ -2716,13 +2715,6 @@ pattern R x y x' y' = Range (Position x y) (Position x' y')
 xfail :: TestTree -> String -> TestTree
 xfail = flip expectFailBecause
 
-xfail8101 :: TestTree -> String -> TestTree
-#if MIN_GHC_API_VERSION(8,10,0)
-xfail8101 = flip expectFailBecause
-#else
-xfail8101 t _ = t
-#endif
-
 expectFailCabal :: String -> TestTree -> TestTree
 #ifdef STACK
 expectFailCabal _ = id