diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d006000..f549d80 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -30,7 +30,8 @@ jobs:
           - os: macos-12
             ghc: system
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
+
       - uses: hspec/setup-haskell@v1
         with:
           ghc-version: ${{ matrix.ghc }}
@@ -47,7 +48,7 @@ jobs:
         # https://github.com/actions/runner-images/blob/macOS-12/20230416.1/images/macos/macos-12-Readme.md#tools
         #
         # (on Linux this is a noop)
-        run: ghcup install cabal 3.10 --set
+        run: ghcup install cabal latest --set
 
       - shell: bash
         run: git config --global init.defaultBranch main
@@ -66,6 +67,20 @@ jobs:
         env:
           HSPEC_OPTIONS: --color
 
+      - run: vim/run-tests.vim
+        if: runner.os == 'Linux'
+
+      - shell: bash
+        run: |
+          vim/test/assets/generate.sh
+          untracked=$(git ls-files --others --exclude-standard)
+          if [ -n "$untracked" ]; then
+            echo "Untracked files:"
+            echo "$untracked"
+            exit 1
+          fi
+          git diff --exit-code
+
   success:
     needs: build
     runs-on: ubuntu-latest
@@ -75,6 +90,6 @@ jobs:
       - run: false
         if: needs.build.result != 'success'
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Check for trailing whitespace
-        run: '! git grep -I "\s\+$"'
+        run: "! git grep -nI '[[:blank:]]$' -- . ':!vim/test/assets'"
diff --git a/README.md b/README.md
index 0d209de..8a70165 100644
--- a/README.md
+++ b/README.md
@@ -51,13 +51,14 @@ instead:
 
 ### Vim integration
 
-You can use `sensei` to load the result of the last test run into your quickfix
+You can use `seito` to load the results of the last test run into your quickfix
 list by executing `:make` in Vim.
 
-For this to work, you can either create a `Makefile` or set `makeprg` to a
-custom value.
+For this to work, you can choose one out of three options:
 
-(In both cases, `sed` is used to strip ANSI color sequences.)
+1. Create a `Makefile`
+2. Set `makeprg` to a custom value
+3. Use [`sensei.vim`](vim/sensei.vim)
 
 #### Option 1: Create a `Makefile`
 
@@ -78,6 +79,16 @@ Add the following to your Vim configuration (e.g.
 :set makeprg=seito
 ```
 
+#### Option 3: Use `sensei.vim`:
+
+Add the following to your Vim configuration (e.g.
+`~/.vim/after/ftplugin/haskell.vim`):
+
+```vim
+let vim_config = system('seito --vim-config')
+execute 'source ' . vim_config
+```
+
 ### Emacs integration
 
 Similarly, you can use `sensei` to load the result of the last test run into an
diff --git a/driver/seito.hs b/driver/seito.hs
index 7c1f760..44a815b 100644
--- a/driver/seito.hs
+++ b/driver/seito.hs
@@ -5,10 +5,12 @@ import           System.Environment
 import           Control.Monad
 import qualified Data.ByteString.Lazy as L
 
+import           Paths_sensei (getDataFileName)
+
 import           Client
 
 main :: IO ()
 main = do
-  (success, output) <- getArgs >>= client ""
+  (success, output) <- getArgs >>= client getDataFileName ""
   L.putStr output
   unless success exitFailure
diff --git a/package.yaml b/package.yaml
index 5f4548d..92c9369 100644
--- a/package.yaml
+++ b/package.yaml
@@ -17,8 +17,7 @@ default-extensions:
   - RecordWildCards
   - ViewPatterns
 
-other-extensions:
-  - NoFieldSelectors
+data-files: vim/sensei.vim
 
 dependencies:
   - base >= 4.11 && < 5
@@ -62,6 +61,7 @@ executables:
 
   seito:
     source-dirs: driver
+    generated-other-modules: Paths_sensei
     main: seito.hs
 
 tests:
diff --git a/sensei.cabal b/sensei.cabal
index 061e932..702199d 100644
--- a/sensei.cabal
+++ b/sensei.cabal
@@ -1,6 +1,6 @@
-cabal-version: 1.12
+cabal-version: 2.0
 
--- This file has been generated from package.yaml by hpack version 0.36.0.
+-- This file has been generated from package.yaml by hpack version 0.37.0.
 --
 -- see: https://github.com/sol/hpack
 
@@ -14,6 +14,8 @@ maintainer:     Simon Hengel <sol@typeful.net>
 license:        MIT
 license-file:   LICENSE
 build-type:     Simple
+data-files:
+    vim/sensei.vim
 
 source-repository head
   type: git
@@ -36,6 +38,9 @@ executable seito
       Session
       Trigger
       Util
+      Paths_sensei
+  autogen-modules:
+      Paths_sensei
   hs-source-dirs:
       src
       driver
@@ -47,8 +52,6 @@ executable seito
       OverloadedStrings
       RecordWildCards
       ViewPatterns
-  other-extensions:
-      NoFieldSelectors
   ghc-options: -Wall -threaded
   build-depends:
       aeson
@@ -105,8 +108,6 @@ executable sensei
       OverloadedStrings
       RecordWildCards
       ViewPatterns
-  other-extensions:
-      NoFieldSelectors
   ghc-options: -Wall -threaded
   build-depends:
       aeson
@@ -163,8 +164,6 @@ executable sensei-web
       OverloadedStrings
       RecordWildCards
       ViewPatterns
-  other-extensions:
-      NoFieldSelectors
   ghc-options: -Wall -threaded
   build-depends:
       aeson
@@ -236,8 +235,6 @@ test-suite spec
       OverloadedStrings
       RecordWildCards
       ViewPatterns
-  other-extensions:
-      NoFieldSelectors
   ghc-options: -Wall -threaded
   cpp-options: -DTEST
   build-tool-depends:
diff --git a/src/Client.hs b/src/Client.hs
index b3dc721..609dc7d 100644
--- a/src/Client.hs
+++ b/src/Client.hs
@@ -11,11 +11,12 @@ import qualified Data.ByteString.Lazy as L
 
 import           HTTP (newSocket, socketName)
 
-client :: FilePath -> [String] -> IO (Bool, L.ByteString)
-client dir args = case args of
+client :: (FilePath -> IO FilePath) -> FilePath -> [String] -> IO (Bool, L.ByteString)
+client getDataFileName dir args = case args of
   [] -> hIsTerminalDevice stdout >>= run
   ["--no-color"] -> run False
   ["--color"] -> run True
+  ["--vim-config"] -> (,) True . fromString <$> getDataFileName "vim/sensei.vim"
   _ -> do
     hPutStrLn stderr $ "Usage: seito [ --color | --no-color ]"
     return (False, "")
diff --git a/test/ClientSpec.hs b/test/ClientSpec.hs
index 38dcfcd..cd15f2d 100644
--- a/test/ClientSpec.hs
+++ b/test/ClientSpec.hs
@@ -24,17 +24,21 @@ spec = do
   describe "client" $ do
     it "accepts --color" $ do
       withSuccess $ \ dir -> do
-        client dir ["--color"] `shouldReturn` (True, fromString $ withColor Green "success")
+        client return dir ["--color"] `shouldReturn` (True, fromString $ withColor Green "success")
 
     it "accepts --no-color" $ do
       withSuccess $ \ dir -> do
-        client dir ["--no-color"] `shouldReturn` (True, "success")
+        client return dir ["--no-color"] `shouldReturn` (True, "success")
 
     it "indicates failure" $ do
       withFailure $ \ dir -> do
-        client dir [] `shouldReturn` (False, "failure")
+        client return dir [] `shouldReturn` (False, "failure")
 
     context "when server socket is missing" $ do
       it "reports error" $ do
         withTempDirectory $ \ dir -> do
-          client dir [] `shouldReturn` (False, "could not connect to " <> fromString (socketName dir) <> "\n")
+          client return dir [] `shouldReturn` (False, "could not connect to " <> fromString (socketName dir) <> "\n")
+
+    context "with --vim-config" $ do
+      it "returns a path to Vim support files" $ do
+        client return undefined ["--vim-config"] `shouldReturn` (True, "vim/sensei.vim")
diff --git a/vim/run-tests.vim b/vim/run-tests.vim
new file mode 100755
index 0000000..e2bd27f
--- /dev/null
+++ b/vim/run-tests.vim
@@ -0,0 +1,39 @@
+#!/bin/env -S vim -u NONE -S
+
+set t_ti=
+set t_te=
+
+highlight red ctermfg=red
+highlight green ctermfg=green
+
+command -nargs=* FAILURE echohl red | echo <args> | echohl none
+command -nargs=* SUCCESS echohl green | echo <args> | echohl none
+
+function CheckResults()
+  if !empty(v:errors)
+    FAILURE "FAILURES:\n"
+    for error in v:errors
+      echo "\n"
+      FAILURE substitute(substitute(substitute(error, "^command line..script ", "", ""), " Expected ", "\n\nexpected: ", ""), " but got", "\n but got:", "")
+    endfor
+    cquit
+  endif
+endfunction
+
+try
+  for name in glob("**/*.test.vim", v:true, v:true)
+    SUCCESS "running " . name
+    execute "source " . name
+  endfor
+catch
+  FAILURE substitute(v:throwpoint, "^command line..script ", "", "")
+  echo "\n"
+  FAILURE v:exception
+  cquit
+endtry
+
+echo "\n"
+
+call CheckResults()
+SUCCESS "SUCCESS"
+quit
diff --git a/vim/sensei.test.vim b/vim/sensei.test.vim
new file mode 100644
index 0000000..4f2e29b
--- /dev/null
+++ b/vim/sensei.test.vim
@@ -0,0 +1,126 @@
+source vim/sensei.vim
+
+function Require(actual, required)
+  for i in range(len(a:required))
+    if a:actual[i] > a:required[i]
+      return 1
+    elseif a:actual[i] < a:required[i]
+      return 0
+    endif
+  endfor
+  return 1
+endfunction
+
+function GhcVersion(name)
+  return matchlist(a:name, '\vghc-(\d+)\.(\d+)\.(\d+)\.errors')[1:3]
+endfunction
+
+function PopulateQuickFixList(name)
+  SUCCESS a:name
+  execute "cgetfile " . a:name
+  return filter(getqflist(), 'v:val.valid')
+endfunction
+
+for name in glob("vim/test/assets/lexical-error.hs.*.errors", v:true, v:true)
+  let errors = PopulateQuickFixList(name)
+  call assert_equal(1, len(errors))
+
+  let err = errors[0]
+  call assert_equal("vim/test/assets/lexical-error.hs", bufname(err.bufnr))
+  call assert_equal(1, err.lnum)
+  call assert_equal(11, err.col)
+  call assert_equal(0, err.end_lnum)
+  call assert_equal(0, err.end_col)
+  call assert_equal('e', err.type)
+  if Require(GhcVersion(name), [9,6])
+    call assert_equal(21231, err.nr)
+  else
+    call assert_equal(-1, err.nr)
+  endif
+  call assert_equal("\n    lexical error in string/character literal at character '\\n'", err.text)
+endfor
+
+for name in glob("vim/test/assets/parse-error.hs.*.errors", v:true, v:true)
+  let errors = PopulateQuickFixList(name)
+  call assert_equal(1, len(errors))
+
+  let err = errors[0]
+  call assert_equal("vim/test/assets/parse-error.hs", bufname(err.bufnr))
+  call assert_equal(1, err.lnum)
+  call assert_equal(1, err.col)
+  call assert_equal(0, err.end_lnum)
+  call assert_equal(0, err.end_col)
+  call assert_equal('e', err.type)
+  if Require(GhcVersion(name), [9,8])
+    call assert_equal(25277, err.nr)
+  else
+    call assert_equal(-1, err.nr)
+  endif
+  call assert_equal("\n    Parse error: module header, import declaration\n    or top-level declaration expected.", err.text)
+endfor
+
+for name in glob("vim/test/assets/type-error.hs.*.errors", v:true, v:true)
+  let errors = PopulateQuickFixList(name)
+  call assert_equal(1, len(errors))
+
+  let err = errors[0]
+  call assert_equal("vim/test/assets/type-error.hs", bufname(err.bufnr))
+  call assert_equal(2, err.lnum)
+  call assert_equal(7, err.col)
+  call assert_equal(0, err.end_lnum)
+  call assert_equal(0, err.end_col)
+  call assert_equal('e', err.type)
+  if Require(GhcVersion(name), [9,6])
+    call assert_equal(83865, err.nr)
+    call assert_equal("\n    Couldn't match type ‘Int’ with ‘[Char]’\n    Expected: String\n      Actual: Int", err.text)
+  else
+    call assert_equal(-1, err.nr)
+    call assert_equal("\n    • Couldn't match type ‘Int’ with ‘[Char]’\n      Expected: String\n        Actual: Int\n    • In the expression: 23 :: Int\n      In an equation for ‘foo’: foo = 23 :: Int", err.text)
+  endif
+endfor
+
+for name in glob("vim/test/assets/type-signature-lacks-binding.hs.*.errors", v:true, v:true)
+  let errors = PopulateQuickFixList(name)
+  call assert_equal(2, len(errors))
+
+  let err = errors[0]
+  call assert_equal("vim/test/assets/type-signature-lacks-binding.hs", bufname(err.bufnr))
+  call assert_equal(1, err.lnum)
+  call assert_equal(1, err.col)
+  call assert_equal(0, err.end_lnum)
+  call assert_equal(0, err.end_col)
+  call assert_equal('e', err.type)
+  if Require(GhcVersion(name), [9,6])
+    call assert_equal(44432, err.nr)
+  else
+    call assert_equal(-1, err.nr)
+  endif
+  call assert_equal("\n    The type signature for ‘foo’ lacks an accompanying binding", err.text)
+
+  let err = errors[1]
+  call assert_equal("vim/test/assets/type-signature-lacks-binding.hs", bufname(err.bufnr))
+  call assert_equal(4, err.lnum)
+  call assert_equal(1, err.col)
+  call assert_equal(0, err.end_lnum)
+  call assert_equal(0, err.end_col)
+  call assert_equal('e', err.type)
+  if Require(GhcVersion(name), [9,6])
+    call assert_equal(44432, err.nr)
+  else
+    call assert_equal(-1, err.nr)
+  endif
+  call assert_equal("\n    The type signature for ‘bar’ lacks an accompanying binding", err.text)
+endfor
+
+let errors = PopulateQuickFixList("vim/test/assets/hspec.hs.errors")
+call assert_equal(1, len(errors))
+
+let err = errors[0]
+call assert_equal("vim/test/assets/hspec.hs", bufname(err.bufnr))
+call assert_equal(6, err.lnum)
+call assert_equal(11, err.col)
+call assert_equal(0, err.end_lnum)
+call assert_equal(0, err.end_col)
+call assert_equal('', err.type)
+call assert_equal(-1, err.nr)
+call assert_equal("", err.text)
diff --git a/vim/sensei.vim b/vim/sensei.vim
new file mode 100644
index 0000000..f95b9e4
--- /dev/null
+++ b/vim/sensei.vim
@@ -0,0 +1,13 @@
+set makeprg=seito
+
+" GHC
+set errorformat=%A%f:%l:%c:\ %t%*[^:]:\ [GHC-%n]
+set errorformat+=%A%f:%l:%c:\ %t%*[^:]: " GHC 9.6
+
+set errorformat^=%+C\ %.%#
+set errorformat^=%Z
+set errorformat^=%-G\ \ \ \ Suggested\ fix:%.%#
+set errorformat^=%-G\ \ \ \ \ \ Perhaps\ you\ meant\ %.%# " GHC 9.2
+
+" Hspec
+set errorformat^=\ \ %f:%l:%c:\ .%#
diff --git a/vim/test/assets/generate.sh b/vim/test/assets/generate.sh
new file mode 100755
index 0000000..d8a32ee
--- /dev/null
+++ b/vim/test/assets/generate.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+for name in $(find vim/test/assets/ -name '*.hs' ! -name '*hspec*'); do
+  for ghc in ghc-9.6 ghc-9.8 ghc-9.10; do
+    if command -v "$ghc" >/dev/null 2>&1; then
+      $ghc -fno-diagnostics-show-caret -fno-show-error-context "$name" &> "$name.ghc-$($ghc --numeric-version).errors"
+    fi
+  done
+  for ghc in ghc-9.2 ghc-9.4; do
+    if command -v "$ghc" >/dev/null 2>&1; then
+      $ghc -fno-diagnostics-show-caret "$name" &> "$name.ghc-$($ghc --numeric-version).errors"
+    fi
+  done
+done
+
+cabal exec -- runhaskell vim/test/assets/hspec.hs --expert --seed 0 > vim/test/assets/hspec.hs.errors
+sed -i 's/Finished in 0.000[0-9] seconds/Finished in 0.0005 seconds/' vim/test/assets/hspec.hs.errors
diff --git a/vim/test/assets/hspec.hs b/vim/test/assets/hspec.hs
new file mode 100644
index 0000000..1522bfa
--- /dev/null
+++ b/vim/test/assets/hspec.hs
@@ -0,0 +1,6 @@
+import Test.Hspec
+
+main :: IO ()
+main = hspec $ do
+  it "foo" $ do
+    "foo" `shouldBe` "bar"
diff --git a/vim/test/assets/hspec.hs.errors b/vim/test/assets/hspec.hs.errors
new file mode 100644
index 0000000..04cf9d6
--- /dev/null
+++ b/vim/test/assets/hspec.hs.errors
@@ -0,0 +1,14 @@
+
+foo [✘]
+
+Failures:
+
+  vim/test/assets/hspec.hs:6:11: 
+  1) foo
+       expected: "bar"
+        but got: "foo"
+
+Randomized with seed 0
+
+Finished in 0.0005 seconds
+1 example, 1 failure
diff --git a/vim/test/assets/lexical-error.hs b/vim/test/assets/lexical-error.hs
new file mode 100644
index 0000000..281b9f6
--- /dev/null
+++ b/vim/test/assets/lexical-error.hs
@@ -0,0 +1 @@
+foo = "bar
diff --git a/vim/test/assets/lexical-error.hs.ghc-9.10.1.errors b/vim/test/assets/lexical-error.hs.ghc-9.10.1.errors
new file mode 100644
index 0000000..ef0e8fb
--- /dev/null
+++ b/vim/test/assets/lexical-error.hs.ghc-9.10.1.errors
@@ -0,0 +1,4 @@
+[1 of 2] Compiling Main             ( vim/test/assets/lexical-error.hs, vim/test/assets/lexical-error.o )
+vim/test/assets/lexical-error.hs:1:11: error: [GHC-21231]
+    lexical error in string/character literal at character '\n'
+
diff --git a/vim/test/assets/lexical-error.hs.ghc-9.2.8.errors b/vim/test/assets/lexical-error.hs.ghc-9.2.8.errors
new file mode 100644
index 0000000..ae31a34
--- /dev/null
+++ b/vim/test/assets/lexical-error.hs.ghc-9.2.8.errors
@@ -0,0 +1,4 @@
+[1 of 1] Compiling Main             ( vim/test/assets/lexical-error.hs, vim/test/assets/lexical-error.o )
+
+vim/test/assets/lexical-error.hs:1:11: error:
+    lexical error in string/character literal at character '\n'
diff --git a/vim/test/assets/lexical-error.hs.ghc-9.4.8.errors b/vim/test/assets/lexical-error.hs.ghc-9.4.8.errors
new file mode 100644
index 0000000..5c4bc74
--- /dev/null
+++ b/vim/test/assets/lexical-error.hs.ghc-9.4.8.errors
@@ -0,0 +1,4 @@
+[1 of 2] Compiling Main             ( vim/test/assets/lexical-error.hs, vim/test/assets/lexical-error.o )
+
+vim/test/assets/lexical-error.hs:1:11: error:
+    lexical error in string/character literal at character '\n'
diff --git a/vim/test/assets/lexical-error.hs.ghc-9.6.6.errors b/vim/test/assets/lexical-error.hs.ghc-9.6.6.errors
new file mode 100644
index 0000000..6215b2a
--- /dev/null
+++ b/vim/test/assets/lexical-error.hs.ghc-9.6.6.errors
@@ -0,0 +1,4 @@
+[1 of 2] Compiling Main             ( vim/test/assets/lexical-error.hs, vim/test/assets/lexical-error.o )
+
+vim/test/assets/lexical-error.hs:1:11: error: [GHC-21231]
+    lexical error in string/character literal at character '\n'
diff --git a/vim/test/assets/lexical-error.hs.ghc-9.8.2.errors b/vim/test/assets/lexical-error.hs.ghc-9.8.2.errors
new file mode 100644
index 0000000..6215b2a
--- /dev/null
+++ b/vim/test/assets/lexical-error.hs.ghc-9.8.2.errors
@@ -0,0 +1,4 @@
+[1 of 2] Compiling Main             ( vim/test/assets/lexical-error.hs, vim/test/assets/lexical-error.o )
+
+vim/test/assets/lexical-error.hs:1:11: error: [GHC-21231]
+    lexical error in string/character literal at character '\n'
diff --git a/vim/test/assets/parse-error.hs b/vim/test/assets/parse-error.hs
new file mode 100644
index 0000000..e187a3a
--- /dev/null
+++ b/vim/test/assets/parse-error.hs
@@ -0,0 +1,2 @@
+foo : Int
+foo = 23
diff --git a/vim/test/assets/parse-error.hs.ghc-9.10.1.errors b/vim/test/assets/parse-error.hs.ghc-9.10.1.errors
new file mode 100644
index 0000000..7352342
--- /dev/null
+++ b/vim/test/assets/parse-error.hs.ghc-9.10.1.errors
@@ -0,0 +1,5 @@
+[1 of 2] Compiling Main             ( vim/test/assets/parse-error.hs, vim/test/assets/parse-error.o )
+vim/test/assets/parse-error.hs:1:1: error: [GHC-25277]
+    Parse error: module header, import declaration
+    or top-level declaration expected.
+
diff --git a/vim/test/assets/parse-error.hs.ghc-9.2.8.errors b/vim/test/assets/parse-error.hs.ghc-9.2.8.errors
new file mode 100644
index 0000000..1fdc490
--- /dev/null
+++ b/vim/test/assets/parse-error.hs.ghc-9.2.8.errors
@@ -0,0 +1,5 @@
+[1 of 1] Compiling Main             ( vim/test/assets/parse-error.hs, vim/test/assets/parse-error.o )
+
+vim/test/assets/parse-error.hs:1:1: error:
+    Parse error: module header, import declaration
+    or top-level declaration expected.
diff --git a/vim/test/assets/parse-error.hs.ghc-9.4.8.errors b/vim/test/assets/parse-error.hs.ghc-9.4.8.errors
new file mode 100644
index 0000000..f31c804
--- /dev/null
+++ b/vim/test/assets/parse-error.hs.ghc-9.4.8.errors
@@ -0,0 +1,5 @@
+[1 of 2] Compiling Main             ( vim/test/assets/parse-error.hs, vim/test/assets/parse-error.o )
+
+vim/test/assets/parse-error.hs:1:1: error:
+    Parse error: module header, import declaration
+    or top-level declaration expected.
diff --git a/vim/test/assets/parse-error.hs.ghc-9.6.6.errors b/vim/test/assets/parse-error.hs.ghc-9.6.6.errors
new file mode 100644
index 0000000..f31c804
--- /dev/null
+++ b/vim/test/assets/parse-error.hs.ghc-9.6.6.errors
@@ -0,0 +1,5 @@
+[1 of 2] Compiling Main             ( vim/test/assets/parse-error.hs, vim/test/assets/parse-error.o )
+
+vim/test/assets/parse-error.hs:1:1: error:
+    Parse error: module header, import declaration
+    or top-level declaration expected.
diff --git a/vim/test/assets/parse-error.hs.ghc-9.8.2.errors b/vim/test/assets/parse-error.hs.ghc-9.8.2.errors
new file mode 100644
index 0000000..78b27f3
--- /dev/null
+++ b/vim/test/assets/parse-error.hs.ghc-9.8.2.errors
@@ -0,0 +1,5 @@
+[1 of 2] Compiling Main             ( vim/test/assets/parse-error.hs, vim/test/assets/parse-error.o )
+
+vim/test/assets/parse-error.hs:1:1: error: [GHC-25277]
+    Parse error: module header, import declaration
+    or top-level declaration expected.
diff --git a/vim/test/assets/type-error.hs b/vim/test/assets/type-error.hs
new file mode 100644
index 0000000..5b28234
--- /dev/null
+++ b/vim/test/assets/type-error.hs
@@ -0,0 +1,2 @@
+foo :: String
+foo = 23 :: Int
diff --git a/vim/test/assets/type-error.hs.ghc-9.10.1.errors b/vim/test/assets/type-error.hs.ghc-9.10.1.errors
new file mode 100644
index 0000000..6e9cea3
--- /dev/null
+++ b/vim/test/assets/type-error.hs.ghc-9.10.1.errors
@@ -0,0 +1,6 @@
+[1 of 2] Compiling Main             ( vim/test/assets/type-error.hs, vim/test/assets/type-error.o )
+vim/test/assets/type-error.hs:2:7: error: [GHC-83865]
+    Couldn't match type ‘Int’ with ‘[Char]’
+    Expected: String
+      Actual: Int
+
diff --git a/vim/test/assets/type-error.hs.ghc-9.2.8.errors b/vim/test/assets/type-error.hs.ghc-9.2.8.errors
new file mode 100644
index 0000000..a40fe9c
--- /dev/null
+++ b/vim/test/assets/type-error.hs.ghc-9.2.8.errors
@@ -0,0 +1,8 @@
+[1 of 1] Compiling Main             ( vim/test/assets/type-error.hs, vim/test/assets/type-error.o )
+
+vim/test/assets/type-error.hs:2:7: error:
+    • Couldn't match type ‘Int’ with ‘[Char]’
+      Expected: String
+        Actual: Int
+    • In the expression: 23 :: Int
+      In an equation for ‘foo’: foo = 23 :: Int
diff --git a/vim/test/assets/type-error.hs.ghc-9.4.8.errors b/vim/test/assets/type-error.hs.ghc-9.4.8.errors
new file mode 100644
index 0000000..6ab819f
--- /dev/null
+++ b/vim/test/assets/type-error.hs.ghc-9.4.8.errors
@@ -0,0 +1,8 @@
+[1 of 2] Compiling Main             ( vim/test/assets/type-error.hs, vim/test/assets/type-error.o )
+
+vim/test/assets/type-error.hs:2:7: error:
+    • Couldn't match type ‘Int’ with ‘[Char]’
+      Expected: String
+        Actual: Int
+    • In the expression: 23 :: Int
+      In an equation for ‘foo’: foo = 23 :: Int
diff --git a/vim/test/assets/type-error.hs.ghc-9.6.6.errors b/vim/test/assets/type-error.hs.ghc-9.6.6.errors
new file mode 100644
index 0000000..83d1421
--- /dev/null
+++ b/vim/test/assets/type-error.hs.ghc-9.6.6.errors
@@ -0,0 +1,6 @@
+[1 of 2] Compiling Main             ( vim/test/assets/type-error.hs, vim/test/assets/type-error.o )
+
+vim/test/assets/type-error.hs:2:7: error: [GHC-83865]
+    Couldn't match type ‘Int’ with ‘[Char]’
+    Expected: String
+      Actual: Int
diff --git a/vim/test/assets/type-error.hs.ghc-9.8.2.errors b/vim/test/assets/type-error.hs.ghc-9.8.2.errors
new file mode 100644
index 0000000..83d1421
--- /dev/null
+++ b/vim/test/assets/type-error.hs.ghc-9.8.2.errors
@@ -0,0 +1,6 @@
+[1 of 2] Compiling Main             ( vim/test/assets/type-error.hs, vim/test/assets/type-error.o )
+
+vim/test/assets/type-error.hs:2:7: error: [GHC-83865]
+    Couldn't match type ‘Int’ with ‘[Char]’
+    Expected: String
+      Actual: Int
diff --git a/vim/test/assets/type-signature-lacks-binding.hs b/vim/test/assets/type-signature-lacks-binding.hs
new file mode 100644
index 0000000..5a9f494
--- /dev/null
+++ b/vim/test/assets/type-signature-lacks-binding.hs
@@ -0,0 +1,5 @@
+foo :: Int
+foo_ = 23
+
+bar :: Int
+bar_ = 23
diff --git a/vim/test/assets/type-signature-lacks-binding.hs.ghc-9.10.1.errors b/vim/test/assets/type-signature-lacks-binding.hs.ghc-9.10.1.errors
new file mode 100644
index 0000000..62fca25
--- /dev/null
+++ b/vim/test/assets/type-signature-lacks-binding.hs.ghc-9.10.1.errors
@@ -0,0 +1,11 @@
+[1 of 2] Compiling Main             ( vim/test/assets/type-signature-lacks-binding.hs, vim/test/assets/type-signature-lacks-binding.o )
+vim/test/assets/type-signature-lacks-binding.hs:1:1: error: [GHC-44432]
+    The type signature for ‘foo’ lacks an accompanying binding
+    Suggested fix:
+      Perhaps use ‘foo_’ (Defined at vim/test/assets/type-signature-lacks-binding.hs:2:1)
+
+vim/test/assets/type-signature-lacks-binding.hs:4:1: error: [GHC-44432]
+    The type signature for ‘bar’ lacks an accompanying binding
+    Suggested fix:
+      Perhaps use ‘bar_’ (Defined at vim/test/assets/type-signature-lacks-binding.hs:5:1)
+
diff --git a/vim/test/assets/type-signature-lacks-binding.hs.ghc-9.2.8.errors b/vim/test/assets/type-signature-lacks-binding.hs.ghc-9.2.8.errors
new file mode 100644
index 0000000..4f23b10
--- /dev/null
+++ b/vim/test/assets/type-signature-lacks-binding.hs.ghc-9.2.8.errors
@@ -0,0 +1,9 @@
+[1 of 1] Compiling Main             ( vim/test/assets/type-signature-lacks-binding.hs, vim/test/assets/type-signature-lacks-binding.o )
+
+vim/test/assets/type-signature-lacks-binding.hs:1:1: error:
+    The type signature for ‘foo’ lacks an accompanying binding
+      Perhaps you meant ‘foo_’ (Defined at vim/test/assets/type-signature-lacks-binding.hs:2:1)
+
+vim/test/assets/type-signature-lacks-binding.hs:4:1: error:
+    The type signature for ‘bar’ lacks an accompanying binding
+      Perhaps you meant ‘bar_’ (Defined at vim/test/assets/type-signature-lacks-binding.hs:5:1)
diff --git a/vim/test/assets/type-signature-lacks-binding.hs.ghc-9.4.8.errors b/vim/test/assets/type-signature-lacks-binding.hs.ghc-9.4.8.errors
new file mode 100644
index 0000000..73c57b8
--- /dev/null
+++ b/vim/test/assets/type-signature-lacks-binding.hs.ghc-9.4.8.errors
@@ -0,0 +1,11 @@
+[1 of 2] Compiling Main             ( vim/test/assets/type-signature-lacks-binding.hs, vim/test/assets/type-signature-lacks-binding.o )
+
+vim/test/assets/type-signature-lacks-binding.hs:1:1: error:
+    The type signature for ‘foo’ lacks an accompanying binding
+    Suggested fix:
+      Perhaps use ‘foo_’ (Defined at vim/test/assets/type-signature-lacks-binding.hs:2:1)
+
+vim/test/assets/type-signature-lacks-binding.hs:4:1: error:
+    The type signature for ‘bar’ lacks an accompanying binding
+    Suggested fix:
+      Perhaps use ‘bar_’ (Defined at vim/test/assets/type-signature-lacks-binding.hs:5:1)
diff --git a/vim/test/assets/type-signature-lacks-binding.hs.ghc-9.6.6.errors b/vim/test/assets/type-signature-lacks-binding.hs.ghc-9.6.6.errors
new file mode 100644
index 0000000..18bb2a7
--- /dev/null
+++ b/vim/test/assets/type-signature-lacks-binding.hs.ghc-9.6.6.errors
@@ -0,0 +1,11 @@
+[1 of 2] Compiling Main             ( vim/test/assets/type-signature-lacks-binding.hs, vim/test/assets/type-signature-lacks-binding.o )
+
+vim/test/assets/type-signature-lacks-binding.hs:1:1: error: [GHC-44432]
+    The type signature for ‘foo’ lacks an accompanying binding
+    Suggested fix:
+      Perhaps use ‘foo_’ (Defined at vim/test/assets/type-signature-lacks-binding.hs:2:1)
+
+vim/test/assets/type-signature-lacks-binding.hs:4:1: error: [GHC-44432]
+    The type signature for ‘bar’ lacks an accompanying binding
+    Suggested fix:
+      Perhaps use ‘bar_’ (Defined at vim/test/assets/type-signature-lacks-binding.hs:5:1)
diff --git a/vim/test/assets/type-signature-lacks-binding.hs.ghc-9.8.2.errors b/vim/test/assets/type-signature-lacks-binding.hs.ghc-9.8.2.errors
new file mode 100644
index 0000000..18bb2a7
--- /dev/null
+++ b/vim/test/assets/type-signature-lacks-binding.hs.ghc-9.8.2.errors
@@ -0,0 +1,11 @@
+[1 of 2] Compiling Main             ( vim/test/assets/type-signature-lacks-binding.hs, vim/test/assets/type-signature-lacks-binding.o )
+
+vim/test/assets/type-signature-lacks-binding.hs:1:1: error: [GHC-44432]
+    The type signature for ‘foo’ lacks an accompanying binding
+    Suggested fix:
+      Perhaps use ‘foo_’ (Defined at vim/test/assets/type-signature-lacks-binding.hs:2:1)
+
+vim/test/assets/type-signature-lacks-binding.hs:4:1: error: [GHC-44432]
+    The type signature for ‘bar’ lacks an accompanying binding
+    Suggested fix:
+      Perhaps use ‘bar_’ (Defined at vim/test/assets/type-signature-lacks-binding.hs:5:1)
diff --git a/watch.sh b/watch.sh
new file mode 100755
index 0000000..f138390
--- /dev/null
+++ b/watch.sh
@@ -0,0 +1,6 @@
+#!/bin/bash
+while true; do
+  echo
+  ./vim/run-tests.vim
+  inotifywait -e modify -e attrib -e close_write -e move -e create -e delete -r vim/
+done