re-enable windows (disabled since move to 'get-tested')

.github/workflows/ci.yml

@@ -1,12 +1,12 @@
 name: haskell ci
-on: 
+on:
   push:
   pull_request:
   workflow_dispatch:
 jobs:
   generate-matrix:
     name: "Generate matrix from cabal"
-    outputs: 
+    outputs:
       matrix: ${{ steps.set-matrix.outputs.matrix }}
     runs-on: ubuntu-latest
     steps:
@@ -17,6 +17,7 @@ jobs:
           cabal-file: placeholder.cabal
           ubuntu-version: latest
           macos-version: latest
+          windows-version: latest
           version: 0.1.7.0
   tests:
     name: ${{ matrix.ghc }} on ${{ matrix.os }}
@@ -25,7 +26,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix: ${{ fromJSON(needs.generate-matrix.outputs.matrix) }}
-    steps: 
+    steps:
       - uses: actions/checkout@v4
       - uses: haskell-actions/setup@v2
         id: setup-haskell

placeholder.cabal

@@ -35,6 +35,7 @@ common test
   import: base
   hs-source-dirs: t
   build-depends:
+    filepath >= 1.4,
     placeholder,
     tasty >= 1.2,
     tasty-hunit >= 0.10.0

t/Test.hs

@@ -5,6 +5,7 @@ import Control.Exception
 import Control.Monad (when)
 import Control.Placeholder
 import Data.List
+import System.FilePath((</>))
 import Test.Tasty
 import Test.Tasty.HUnit
 
@@ -32,13 +33,13 @@ todoTest = do
   assertBool ("unexpected HasCallStack format: " ++ msg) $
     all has [
       "CallStack (from HasCallStack):"
-    , "todo, called at t/Test.hs:27:47 in main:Main"
+    , "todo, called at t" </> "Test.hs:28:47 in main:Main"
     ]
   when (has "CallStack (from -prof)") $ --enable-profiling enabled
     assertBool ("unexpected -prof stack format: " ++ msg) $
       all has [
-        "Control.Placeholder.todo (src/Control/Placeholder.hs:116:1-66)"
-      , "Main.todoTest (t/Test.hs:(26,1)-(43,7))"
+        "Control.Placeholder.todo (src" </> "Control" </> "Placeholder.hs:116:1-66)"
+      , "Main.todoTest (t" </> "Test.hs:(27,1)-(44,7))"
       , "Main.CAF (<entire-module>)"
       ]