Add more tests

Author: Linyxus

tests/neg-custom-args/captures/i24309a.check

@@ -0,0 +1,4 @@
+import language.experimental.captureChecking
+def runOps[C^](ops: List[() ->{C} Unit]): Unit = ???
+def runOps1[C^](xs: Object^{C}): Unit = runOps[{C}](???)  // ok
+def runOps2[C^](): Unit = runOps[{C}](???)  // error

tests/neg-custom-args/captures/i24309a.scala

@@ -0,0 +1,5 @@
+import language.experimental.captureChecking
+trait Region[R^]
+def id[T](x: T): T = ???
+def foo[R^](r: Region[R]): Unit =
+  val t2 = () => id[Object^{R}](???)  // was error, now ok