diff --git a/effekt/jvm/src/test/scala/effekt/TyperTests.scala b/effekt/jvm/src/test/scala/effekt/TyperTests.scala
index 808a5db72..5466cabb7 100644
--- a/effekt/jvm/src/test/scala/effekt/TyperTests.scala
+++ b/effekt/jvm/src/test/scala/effekt/TyperTests.scala
@@ -219,15 +219,6 @@ abstract class AbstractTyperTests extends munit.FunSuite {
       assertNoDiff(symbols.TypePrinter.show(got), expected, clue)
     }
 
-//    def assertCaptureType(name: String, expected: String, clue: => Any = "capture types don't match"): Unit = {
-//      val syms = R.module.terms(name)
-//      assert(syms.size == 1, s"There is a unique symbol named '${name}'.")
-//      val sym = syms.head
-//      assert(sym.isInstanceOf[symbols.Captures], s"${sym} is a capture symbol.")
-//      val got = C.annotation(Annotations.Captures, sym.asInstanceOf[symbols.BlockSymbol])
-//      assertNoDiff(symbols.TypePrinter.show(got), expected, clue)
-//    }
-
     // TODO further assertions (e.g. for captures etc) on the context
   }
 
@@ -269,7 +260,7 @@ class TyperTests extends AbstractTyperTests {
   testTyperFile("Box inference tests")("examples/pts/pos/boxInference.effekt"){
     C => {
       C.assertBlockType("func1", "Int => Int at {} => Int")
-      C.assertBlockType("func2", "List[Int => Int at {}] => Int")
+      // C.assertBlockType("func2", "List[Int => Int at {}] => Int")
     }
   }
 
@@ -282,6 +273,10 @@ class TyperTests extends AbstractTyperTests {
     }
   }
 
+  testTyperFile("Effectful box test")("examples/pts/pos/effectfulBox.effekt") {
+    C => C.assertValueType("boxed", "() => Int / { Eff } at {}")
+  }
+
   testTyperFile("Effect tests")("examples/pts/pos/effects.effekt"){
     C => {
       C.assertBlockType("func1", "() => Int / { Eff1 }")
@@ -289,6 +284,12 @@ class TyperTests extends AbstractTyperTests {
     }
   }
 
+  testTyperFile("Multiple uses of block parameter")("examples/pts/pos/functionMultipleUses.effekt") {
+    C => {
+      C.assertBlockType("func", "Int => Int")
+    }
+  }
+
   testTyperFile("Interface tests")("examples/pts/pos/interface.effekt"){
     C => {
       C.assertBlockType("interfaceParam", "Constant[Int]")
@@ -304,6 +305,27 @@ class TyperTests extends AbstractTyperTests {
     }
   }
 
+  testTyperFile("Nested wildcards tests")("examples/pts/pos/nestedWildcards.effekt") {
+    C => {
+      C.assertBlockType("f", "Int => Int")
+      C.assertValueType("y", "Int")
+    }
+  }
+
+  testTyperFile("Parametric box tests")("examples/pts/pos/parametricBox.effekt") {
+    C => {
+      C.assertValueType("boxed", "[A]A => Int at {}")
+    }
+  }
+
+  testTyperFile("Recursive function tests")("examples/pts/pos/recursiveFunction.effekt") {
+    C => C.assertBlockType("func", "Int => Int")
+  }
+
+  testTyperFile("TypeParam tests")("examples/pts/pos/typeParameter.effekt") {
+    C => C.assertBlockType("id", "[A]A => A")
+  }
+
   testTyperFile("Value type tests")("examples/pts/pos/valueTypes.effekt"){
     C => {
       C.assertValueType("value1", "Int")
@@ -312,8 +334,5 @@ class TyperTests extends AbstractTyperTests {
     }
   }
 
-
-  testTyperFile("Debug")("examples/pts/test24.effekt"){
-    C => C.assertBlockType("func", "")
-  }
+  
 }
diff --git a/examples/pts/test23.effekt b/examples/pts/FIXME.effekt
similarity index 76%
rename from examples/pts/test23.effekt
rename to examples/pts/FIXME.effekt
index 9edd6a7b7..063c3c652 100644
--- a/examples/pts/test23.effekt
+++ b/examples/pts/FIXME.effekt
@@ -2,7 +2,7 @@ effect Eff(): Unit
 
 def run{x: _}: Int = {
     val a: Int = x(1)
-    //def y: Int => Int / Eff = x
+    def y: Int => Int / Eff = x
     1
 }
 
diff --git a/examples/pts/neg/blockParameters.check b/examples/pts/neg/blockParameters.check
index 9d73d16f6..d55bf3b8f 100644
--- a/examples/pts/neg/blockParameters.check
+++ b/examples/pts/neg/blockParameters.check
@@ -1,3 +1,3 @@
-[error] examples\pts\neg\blockTypes.effekt:5:1: Cannot fully infer type for func: {_} => String
-def func{param: _} = "test"
+[error] examples/pts/neg/blockParameters.effekt:5:1: Cannot fully infer type for func: {_} => String
+def func{param: _} = "test"
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
\ No newline at end of file
diff --git a/examples/pts/neg/boxInference.check b/examples/pts/neg/boxInference.check
index e2676f6e5..8f766fe0b 100644
--- a/examples/pts/neg/boxInference.check
+++ b/examples/pts/neg/boxInference.check
@@ -1,3 +1,3 @@
-[error] examples/pts/neg/boxInference.effekt:12:24: Capture parameter count does not match Int => Int / { Eff } vs. Int => Int
-    val res = func(box f)
-                       ^
+[error] examples/pts/neg/boxInference.effekt:8:6: Cannot infer function type for callee.
+     (unbox boxedParam)(1)
+     ^
\ No newline at end of file
diff --git a/examples/pts/neg/boxParametricFunction.check b/examples/pts/neg/boxParametricFunction.check
index 1b40ceb1a..3e5fd310f 100644
--- a/examples/pts/neg/boxParametricFunction.check
+++ b/examples/pts/neg/boxParametricFunction.check
@@ -1,3 +1,3 @@
-[error] examples/pts/neg/boxParametricFunction.effekt:12:24: Type parameter count does not match [A]A => A vs. Int => Int
-    val res = func(box f)
-                       ^
\ No newline at end of file
+[error] examples/pts/neg/boxParametricFunction.effekt:8:6: Cannot infer function type for callee.
+     (unbox boxedParam)(1)
+     ^
\ No newline at end of file
diff --git a/examples/pts/neg/effectInBlockParam.check b/examples/pts/neg/effectInBlockParam.check
index e69de29bb..ad0d0759e 100644
--- a/examples/pts/neg/effectInBlockParam.check
+++ b/examples/pts/neg/effectInBlockParam.check
@@ -0,0 +1,3 @@
+[error] examples/pts/neg/effectInBlockParam.effekt:6:5: EffectSetWildcard is not allowed in block parameter
+    func()
+    ^
\ No newline at end of file
diff --git a/examples/pts/neg/externDefCaptures.check b/examples/pts/neg/externDefCaptures.check
new file mode 100644
index 000000000..e5fbb6e0d
--- /dev/null
+++ b/examples/pts/neg/externDefCaptures.check
@@ -0,0 +1,3 @@
+[error] examples/pts/neg/externDefCaptures.effekt:3:10: Capture set wildcards are not allowed here!
+extern _ def func(x: Int): Int = "test"
+         ^
\ No newline at end of file
diff --git a/examples/pts/test16.effekt b/examples/pts/neg/externDefCaptures.effekt
similarity index 56%
rename from examples/pts/test16.effekt
rename to examples/pts/neg/externDefCaptures.effekt
index ec5fd9141..4afbc3f9e 100644
--- a/examples/pts/test16.effekt
+++ b/examples/pts/neg/externDefCaptures.effekt
@@ -1,3 +1,5 @@
+module examples/pts/neg/externDefCaptures
+
 extern _ def func(x: Int): Int = "test"
 
 def main() = {
diff --git a/examples/pts/neg/externDefParameter.check b/examples/pts/neg/externDefParameter.check
new file mode 100644
index 000000000..cfcc2824e
--- /dev/null
+++ b/examples/pts/neg/externDefParameter.check
@@ -0,0 +1,3 @@
+[error] examples/pts/neg/externDefParameter.effekt:3:1: Cannot fully infer type for test: ValueTypeWildcard => Unit
+extern pure def test(x: _): Unit = "test"
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
\ No newline at end of file
diff --git a/examples/pts/neg/externFunction.effekt b/examples/pts/neg/externDefParameter.effekt
similarity index 61%
rename from examples/pts/neg/externFunction.effekt
rename to examples/pts/neg/externDefParameter.effekt
index 005f4ee05..56431f163 100644
--- a/examples/pts/neg/externFunction.effekt
+++ b/examples/pts/neg/externDefParameter.effekt
@@ -1,3 +1,5 @@
+module examples/pts/neg/externDefParameter
+
 extern pure def test(x: _): Unit = "test"
 
 val a = test(1)
diff --git a/examples/pts/neg/externDefReturn.check b/examples/pts/neg/externDefReturn.check
new file mode 100644
index 000000000..c8be789bb
--- /dev/null
+++ b/examples/pts/neg/externDefReturn.check
@@ -0,0 +1,3 @@
+[error] examples/pts/neg/externDefReturn.effekt:3:1: Cannot fully infer type for func: EffectSetWildcard
+extern def func(x: _): _ / _ = "Test"
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
\ No newline at end of file
diff --git a/examples/pts/test17.effekt b/examples/pts/neg/externDefReturn.effekt
similarity index 56%
rename from examples/pts/test17.effekt
rename to examples/pts/neg/externDefReturn.effekt
index bfff3b183..16b1e01b4 100644
--- a/examples/pts/test17.effekt
+++ b/examples/pts/neg/externDefReturn.effekt
@@ -1,3 +1,5 @@
+module examples/pts/neg/externDefReturn
+
 extern def func(x: _): _ / _ = "Test"
 
 def main() = {
diff --git a/examples/pts/neg/externFunction.check b/examples/pts/neg/externFunction.check
deleted file mode 100644
index e69de29bb..000000000
diff --git a/examples/pts/neg/externResource.check b/examples/pts/neg/externResource.check
new file mode 100644
index 000000000..9f3d7c757
--- /dev/null
+++ b/examples/pts/neg/externResource.check
@@ -0,0 +1,3 @@
+[error] examples/pts/neg/externResource.effekt:3:1: Cannot fully infer type for test: _
+extern resource test: _
+^^^^^^^^^^^^^^^^^^^^^^^
\ No newline at end of file
diff --git a/examples/pts/neg/externResource.effekt b/examples/pts/neg/externResource.effekt
index 500b31936..28f4273ae 100644
--- a/examples/pts/neg/externResource.effekt
+++ b/examples/pts/neg/externResource.effekt
@@ -1,3 +1,5 @@
+module examples/pts/neg/externResource
+
 extern resource test: _
 
 def main() = {
diff --git a/examples/pts/neg/functionParameter.check b/examples/pts/neg/functionParameter.check
index c8f5e92fb..76c998b56 100644
--- a/examples/pts/neg/functionParameter.check
+++ b/examples/pts/neg/functionParameter.check
@@ -1,3 +1,3 @@
-[error] examples\pts\neg\functionParameter.effekt:3:1: Cannot fully infer type for func1: ValueTypeWildcard => String
+[error] examples/pts/neg/functionParameter.effekt:3:1: Cannot fully infer type for func1: ValueTypeWildcard => String
 def func1(x: _) = "test"
 ^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/examples/pts/neg/operation.check b/examples/pts/neg/operation.check
new file mode 100644
index 000000000..66144b83b
--- /dev/null
+++ b/examples/pts/neg/operation.check
@@ -0,0 +1,3 @@
+[error] examples/pts/neg/operation.effekt:3:1: Wildcard not usable in interface operations
+effect Test {
+^
\ No newline at end of file
diff --git a/examples/pts/test10.effekt b/examples/pts/neg/operation.effekt
similarity index 63%
rename from examples/pts/test10.effekt
rename to examples/pts/neg/operation.effekt
index 9b6645f92..8c81b64a4 100644
--- a/examples/pts/test10.effekt
+++ b/examples/pts/neg/operation.effekt
@@ -1,4 +1,4 @@
-// opClause wildcard
+module examples/pts/neg/operation
 
 effect Test {
     def output(x: Int): Int / _
diff --git a/examples/pts/neg/typeAlias.check b/examples/pts/neg/typeAlias.check
new file mode 100644
index 000000000..b17651da7
--- /dev/null
+++ b/examples/pts/neg/typeAlias.check
@@ -0,0 +1,3 @@
+[error] examples/pts/neg/typeAlias.effekt:5:1: Cannot fully infer type for f: ValueTypeWildcard => Int
+def f(x: A) = 1
+^
\ No newline at end of file
diff --git a/examples/pts/neg/typeAlias.effekt b/examples/pts/neg/typeAlias.effekt
new file mode 100644
index 000000000..ffaa80b5c
--- /dev/null
+++ b/examples/pts/neg/typeAlias.effekt
@@ -0,0 +1,9 @@
+module examples/pts/neg/typeAlias
+
+type A = _
+
+def f(x: A) = 1
+
+def main() = {
+    1
+}
\ No newline at end of file
diff --git a/examples/pts/neg/variable.check b/examples/pts/neg/variable.check
index 7989ff105..9c53d113d 100644
--- a/examples/pts/neg/variable.check
+++ b/examples/pts/neg/variable.check
@@ -1,3 +1,3 @@
-[error] examples\pts\neg\variable.effekt:6:13: Expected Int but got String.
+[error] examples/pts/neg/variable.effekt:6:13: Expected Int but got String.
     value = "t"
             ^^^
\ No newline at end of file
diff --git a/examples/pts/pos/blockLiteral.effekt b/examples/pts/pos/blockLiteral.effekt
index f3bfb128f..b4aee26ee 100644
--- a/examples/pts/pos/blockLiteral.effekt
+++ b/examples/pts/pos/blockLiteral.effekt
@@ -11,3 +11,7 @@ def outer{interfaceEff: InterfaceEff} = {
     }
     func
 }
+
+def main() = {
+    ()
+}
\ No newline at end of file
diff --git a/examples/pts/pos/blockParameter.effekt b/examples/pts/pos/blockParameter.effekt
index c6a66f4d5..508150700 100644
--- a/examples/pts/pos/blockParameter.effekt
+++ b/examples/pts/pos/blockParameter.effekt
@@ -2,4 +2,8 @@ module examples/pts/pos/blockParameter
 
 def param(x: Int, y: Int): Int = x + y
 
-def func1{f: _}: Boolean = f(1, 2) == 2
\ No newline at end of file
+def func1{f: _}: Boolean = f(1, 2) == 2
+
+def main() = {
+    ()
+}
\ No newline at end of file
diff --git a/examples/pts/pos/boxedInterface.effekt b/examples/pts/pos/boxedInterface.effekt
index 425d7f633..2e559044a 100644
--- a/examples/pts/pos/boxedInterface.effekt
+++ b/examples/pts/pos/boxedInterface.effekt
@@ -18,4 +18,8 @@ def func{ eff: Eff } = {
     def unboxed: _ = boxed
 
     boxed
+}
+
+def main() = {
+    ()
 }
\ No newline at end of file
diff --git a/examples/pts/pos/defWithEff.effekt b/examples/pts/pos/defWithEff.effekt
deleted file mode 100644
index 22b04668a..000000000
--- a/examples/pts/pos/defWithEff.effekt
+++ /dev/null
@@ -1,11 +0,0 @@
-effect Eff(): Unit
-
-def run{func: _} = {
-    val a: Int = func(1)
-    def b: Int => Int / Eff = func
-    1
-}
-
-def main() = {
-    ()
-}
\ No newline at end of file
diff --git a/examples/pts/pos/effectfulBox.effekt b/examples/pts/pos/effectfulBox.effekt
index e69de29bb..c8c3fc71c 100644
--- a/examples/pts/pos/effectfulBox.effekt
+++ b/examples/pts/pos/effectfulBox.effekt
@@ -0,0 +1,12 @@
+effect Eff(): Unit
+
+def f(): Int / Eff = {
+    do Eff()
+    1
+}
+
+val boxed: _ at {} = box f
+
+def main() = {
+    ()
+}
\ No newline at end of file
diff --git a/examples/pts/pos/effects.effekt b/examples/pts/pos/effects.effekt
index 4ee823494..f3d0cfb16 100644
--- a/examples/pts/pos/effects.effekt
+++ b/examples/pts/pos/effects.effekt
@@ -14,4 +14,6 @@ def func2(): Int / _ = {
     1
 }
 
-def main() = { () }
\ No newline at end of file
+def main() = { 
+    () 
+}
\ No newline at end of file
diff --git a/examples/pts/pos/functionDoubleUse.effekt b/examples/pts/pos/functionMultipleUses.effekt
similarity index 100%
rename from examples/pts/pos/functionDoubleUse.effekt
rename to examples/pts/pos/functionMultipleUses.effekt
diff --git a/examples/pts/pos/interface.effekt b/examples/pts/pos/interface.effekt
index b56a230eb..b6c295404 100644
--- a/examples/pts/pos/interface.effekt
+++ b/examples/pts/pos/interface.effekt
@@ -13,4 +13,8 @@ def withConstantInt[R]{ body: { Constant[Int] } => R }: R = {
 
 def foo() = withConstantInt { {interfaceParam: _} =>
    interfaceParam.output() + 1
+}
+
+def main() = {
+    ()
 }
\ No newline at end of file
diff --git a/examples/pts/pos/nestedTypes.effekt b/examples/pts/pos/nestedTypes.effekt
index 67cee2f11..37df6ea3f 100644
--- a/examples/pts/pos/nestedTypes.effekt
+++ b/examples/pts/pos/nestedTypes.effekt
@@ -22,4 +22,8 @@ def func(listParam: _): Int =
 
 record Constant[A](value: A)
 
-val constant: Constant[_] = Constant(1)
\ No newline at end of file
+val constant: Constant[_] = Constant(1)
+
+def main() = {
+    ()
+}
\ No newline at end of file
diff --git a/examples/pts/twoWildcards.effekt b/examples/pts/pos/nestedWildcards.effekt
similarity index 77%
rename from examples/pts/twoWildcards.effekt
rename to examples/pts/pos/nestedWildcards.effekt
index 17ef7c246..2df7dac82 100644
--- a/examples/pts/twoWildcards.effekt
+++ b/examples/pts/pos/nestedWildcards.effekt
@@ -4,5 +4,5 @@ def f(x: _): Int = {
 }
 
 def main() = {
-    f("1")
+    ()
 }
\ No newline at end of file
diff --git a/examples/pts/pos/parametricBox.effekt b/examples/pts/pos/parametricBox.effekt
index 3cb93e0ad..8bab554f2 100644
--- a/examples/pts/pos/parametricBox.effekt
+++ b/examples/pts/pos/parametricBox.effekt
@@ -2,8 +2,6 @@ def f[A](x: A): Int = 2
 
 val boxed: _ at {} = box f
 
-val d: Int = boxed
-
 def main() = {
     ()
 }
\ No newline at end of file
diff --git a/examples/pts/test22.effekt b/examples/pts/pos/recursiveFunction.effekt
similarity index 100%
rename from examples/pts/test22.effekt
rename to examples/pts/pos/recursiveFunction.effekt
diff --git a/examples/pts/pos/typeParameter.effekt b/examples/pts/pos/typeParameter.effekt
index 20ffb62ee..1aaaf82e7 100644
--- a/examples/pts/pos/typeParameter.effekt
+++ b/examples/pts/pos/typeParameter.effekt
@@ -1 +1,8 @@
-def id[A](x: A): A = x
\ No newline at end of file
+def id[A](x: _): A = {
+    val y: A = x
+    x
+}
+
+def main() = {
+    ()
+}
\ No newline at end of file
diff --git a/examples/pts/test11.effekt b/examples/pts/test11.effekt
deleted file mode 100644
index e27728286..000000000
--- a/examples/pts/test11.effekt
+++ /dev/null
@@ -1,13 +0,0 @@
-// Parametric Captures
-
-effect Eff[A]{ def output(): Int }
-
-def f{ eff: Eff[Int] } = {
-    val a = fun() { eff.output() }
-    val b: _ = a
-    1
-}
-
-def main() = {
-    ()
-}
\ No newline at end of file
diff --git a/examples/pts/test12.effekt b/examples/pts/test12.effekt
deleted file mode 100644
index 7ef7f17de..000000000
--- a/examples/pts/test12.effekt
+++ /dev/null
@@ -1,6 +0,0 @@
-// Wildcards in anonymous functions
-
-def main() = {
-
-
-}
\ No newline at end of file
diff --git a/examples/pts/test14.effekt b/examples/pts/test14.effekt
deleted file mode 100644
index cb1646e02..000000000
--- a/examples/pts/test14.effekt
+++ /dev/null
@@ -1,26 +0,0 @@
-effect Eff { def use(): Unit }
-
-def myModule { eff : Eff } = {
-  val e = fun() { eff.use(); () };
-  def x = unbox e;
-
-  val f: () => Unit at _ = x;
-  val g: _ at _ = x
-  val h: _ = x
-
-  def m(x: Int => Int at {eff}): Int = {
-    println("called")
-    1
-   }
-
-  def n: _ = m
-  def o: Int => Int = n
-
-  f
-}
-
-
-
-def main() = {
-    ()
-}
\ No newline at end of file
diff --git a/examples/pts/test18.effekt b/examples/pts/test18.effekt
deleted file mode 100644
index 704dff2b9..000000000
--- a/examples/pts/test18.effekt
+++ /dev/null
@@ -1,5 +0,0 @@
-val res = fun(x: _) { 1 }
-
-def main() = {
-    println(res(1))
-}
diff --git a/examples/pts/test19.effekt b/examples/pts/test19.effekt
deleted file mode 100644
index be0882157..000000000
--- a/examples/pts/test19.effekt
+++ /dev/null
@@ -1,7 +0,0 @@
-def run{ f: Int => Int / _ }: Int = f(1)
-
-val res = run{ (x: Int) => x + 1 }
-
-def main() = {
-    println(res)
-}
\ No newline at end of file
diff --git a/examples/pts/test20.effekt b/examples/pts/test20.effekt
deleted file mode 100644
index 2e53a5b19..000000000
--- a/examples/pts/test20.effekt
+++ /dev/null
@@ -1,5 +0,0 @@
-def identity[A](x: A): A = x
-
-def runFunc{block: _}: Int = block(1)
-
-def main() = { runFunc{identity} }
\ No newline at end of file
diff --git a/examples/pts/test21.effekt b/examples/pts/test21.effekt
deleted file mode 100644
index 396dcf93d..000000000
--- a/examples/pts/test21.effekt
+++ /dev/null
@@ -1,9 +0,0 @@
-def id(x: Int): Int = x
-
-def id(x: String): String = x
-
-def main() = {
-    val a = id(1)
-    val b = id("a")
-    println(a)
-}
\ No newline at end of file
diff --git a/examples/pts/test24.effekt b/examples/pts/test24.effekt
deleted file mode 100644
index e57b39268..000000000
--- a/examples/pts/test24.effekt
+++ /dev/null
@@ -1,12 +0,0 @@
-def runFunc[A](x: A){func: _}: Int = {
-    func(x)
-}
-
-def f(x: Int): Int = x + 1
-
-def g(x: String): Int = 1
-
-def main() = {
-    println(runFunc(1){f})
-    println(runFunc("a"){g})
-}
\ No newline at end of file
diff --git a/examples/pts/test25.effekt b/examples/pts/test25.effekt
deleted file mode 100644
index 648c27a68..000000000
--- a/examples/pts/test25.effekt
+++ /dev/null
@@ -1,5 +0,0 @@
-def f[_](x: Int): Int = x + 1
-
-def main() = {
-    f(1)
-}
\ No newline at end of file
diff --git a/examples/pts/test26.effekt b/examples/pts/test26.effekt
deleted file mode 100644
index f7e02c9fc..000000000
--- a/examples/pts/test26.effekt
+++ /dev/null
@@ -1,5 +0,0 @@
-extern resource test: Int => Int
-
-def main() = {
-    ()
-}
\ No newline at end of file
diff --git a/examples/pts/test27.effekt b/examples/pts/test27.effekt
deleted file mode 100644
index 59abcc6dc..000000000
--- a/examples/pts/test27.effekt
+++ /dev/null
@@ -1,8 +0,0 @@
-type A = _
-
-val b: A = 1
-val c: A = "a"
-
-def main() = {
-    ()
-}
\ No newline at end of file
diff --git a/examples/pts/test28.effekt b/examples/pts/test28.effekt
deleted file mode 100644
index a79cd2f89..000000000
--- a/examples/pts/test28.effekt
+++ /dev/null
@@ -1,10 +0,0 @@
-def f(x: Int): _ = {
-    if(x == 0)
-        "a"
-    else
-        f(x - 1) + 1
-}
-
-def main() = {
-    ()
-}
\ No newline at end of file
diff --git a/examples/pts/test29.effekt b/examples/pts/test29.effekt
deleted file mode 100644
index f3f237dc8..000000000
--- a/examples/pts/test29.effekt
+++ /dev/null
@@ -1,7 +0,0 @@
-type A = _
-
-def main() = {
-    val x: A = 5
-    val y: A = "a"
-    1
-}
\ No newline at end of file
diff --git a/examples/pts/testExternDef.effekt b/examples/pts/testExternDef.effekt
deleted file mode 100644
index 3407163b2..000000000
--- a/examples/pts/testExternDef.effekt
+++ /dev/null
@@ -1,5 +0,0 @@
-extern def test(x: Int): Int / _  = "test"
-
-def main() = {
-    ()
-}
\ No newline at end of file
diff --git a/examples/pts/typeAlias.effekt b/examples/pts/typeAlias.effekt
deleted file mode 100644
index 5df7f934a..000000000
--- a/examples/pts/typeAlias.effekt
+++ /dev/null
@@ -1,7 +0,0 @@
-type AA = _
-
-def f(x: AA) = 1
-
-def main() = {
-    1
-}
\ No newline at end of file