Update test

Author: noti0na1

tests/neg-custom-args/captures/extending-impure-function.scala

@@ -0,0 +1,30 @@
+class F1 extends (Int => Unit) {
+  def apply(x: Int): Unit = ()
+}
+
+class F2 extends (Int -> Unit) {
+  def apply(x: Int): Unit = ()
+}
+
+def test =
+  val x1 = new (Int => Unit) {
+    def apply(x: Int): Unit = ()
+  }
+
+  val x2: Int -> Unit = new (Int => Unit) { // error
+    def apply(x: Int): Unit = ()
+  }
+
+  val x3: Int -> Unit = new (Int -> Unit) {
+    def apply(x: Int): Unit = ()
+  }
+
+  val y1: Int => Unit = new F1
+  val y2: Int -> Unit = new F1 // error
+  val y3: Int => Unit = new F2
+  val y4: Int -> Unit = new F2
+
+  val z1 = () => ()
+  val z2: () -> Unit = () => ()
+  val z3: () -> Unit = z1
+  val z4: () => Unit = () => ()