add one test for type parameter healing

Author: Linyxus

tests/neg-custom-args/captures/heal-tparam-cs.scala

@@ -0,0 +1,33 @@
+import language.experimental.captureChecking
+
+trait Cap { def use(): Unit }
+
+def localCap[T](op: (cap: {*} Cap) => T): T = ???
+
+def main(io: {*} Cap, net: {*} Cap): Unit = {
+  val test1 = localCap { cap => // error
+    () => { cap.use() }
+  }
+
+  val test2: (cap: {*} Cap) -> {cap} () -> Unit =
+    localCap { cap =>  // should work
+      (cap1: {*} Cap) => () => { cap1.use() }
+    }
+
+  val test3: (cap: {io} Cap) -> {io} () -> Unit =
+    localCap { cap =>  // should work
+      (cap1: {io} Cap) => () => { cap1.use() }
+    }
+
+  val test4: (cap: {io} Cap) -> {net} () -> Unit =
+    localCap { cap =>  // error
+      (cap1: {io} Cap) => () => { cap1.use() }
+    }
+
+  def localCap2[T](op: (cap: {io} Cap) => T): T = ???
+
+  val test5: {io} () -> Unit =
+    localCap2 { cap =>  // ok
+      () => { cap.use() }
+    }
+}