diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b25c9787..e2b76021 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -39,3 +39,5 @@ jobs:
       - run: npm i 
       - run: npm run bundle
       - run: node ./run-example-tests.js
+      - run: node ./run-should-fail-tests.js
+
diff --git a/run-example-tests.js b/run-example-tests.js
index 7629ec0f..f96775a4 100644
--- a/run-example-tests.js
+++ b/run-example-tests.js
@@ -1,6 +1,6 @@
 const { readdirSync } = require('fs')
-const {promisify} = require('util')
-const exec = promisify(require("exec-sh"))
+const { promisify } = require('util')
+const exec = promisify(require('exec-sh'))
 
 const getDirectories = source =>
   readdirSync(source, { withFileTypes: true })
@@ -8,13 +8,12 @@ const getDirectories = source =>
     .map(dirent => dirent.name)
 
 const go = async () => {
+  const packages = getDirectories('./examples')
 
-    const packages = getDirectories('./examples');
-
-    for(let package of packages){
-        console.log(`Testing ${package}`);
-        await exec(`cd "./examples/${package}" && npm t`)
-    }
+  for (const p of packages) {
+    console.log(`Testing ${p}`)
+    await exec(`cd "./examples/${p}" && npm t`)
+  }
 }
 
-go()
\ No newline at end of file
+go()
diff --git a/src/GraphQL/Client/Args.purs b/src/GraphQL/Client/Args.purs
index 46a95941..1dd701e2 100644
--- a/src/GraphQL/Client/Args.purs
+++ b/src/GraphQL/Client/Args.purs
@@ -7,7 +7,6 @@ import Data.DateTime (DateTime)
 import Data.Maybe (Maybe)
 import Data.Symbol (class IsSymbol, SProxy)
 import Data.Time (Time)
-import Data.Typelevel.Bool (False, True)
 import Heterogeneous.Folding (class FoldingWithIndex, class HFoldlWithIndex)
 import Heterogeneous.Mapping (class HMapWithIndex, class MappingWithIndex)
 import Prim.Row as Row
@@ -33,17 +32,12 @@ infixr 6 AndArg as ++
 
 class ArgGql params arg
 
-instance argToGqlNotNull :: (MaybeNotAllowedForNotNullArgs False arg, ArgGql param arg) => ArgGql (NotNull param) arg
-else instance argToGqlMaybe :: ArgGql param arg => ArgGql param (Maybe arg)
+instance argToGqlNotNull :: ArgGql param arg => ArgGql (NotNull param) arg
+-- else instance argToGqlMaybe :: ArgGql param arg => ArgGql param (Maybe arg)
 else instance argToGqlArray :: ArgGql param arg => ArgGql (Array param) (Array arg)
 else instance argToGqlArrayAnd :: (ArgGql param a1, ArgGql (Array param) a2) => ArgGql (Array param) (AndArg a1 a2)
 else instance argToGqlArrayOne :: ArgGql param arg => ArgGql (Array param) arg
 
-class MaybeNotAllowedForNotNullArgs b t | b -> t 
-
-instance isMaybe :: MaybeNotAllowedForNotNullArgs True (Maybe a)
-
-instance isNotMaybe :: MaybeNotAllowedForNotNullArgs False a
 
 instance argToGqlInt :: ArgGql Int Int
 instance argToGqlNumber :: ArgGql Number Number