Add tests

Author: liufengyun

tests/init/neg/global-cycle10.scala

@@ -0,0 +1,17 @@
+abstract class Base {
+  def foo(): Unit
+  foo()
+}
+
+object O extends Base {              // error
+  val msg: String = "hello"
+
+  class Inner {
+    println(msg)
+  }
+
+  def foo() = new Inner
+}
+
+@main
+def Test = O

tests/init/neg/global-cycle8.scala

@@ -0,0 +1,21 @@
+class A {
+  def foo() = println(O.n)
+}
+
+class B {
+  val a = new A
+}
+
+object O {           // error
+  val n: Int = 10
+  println(P.m)
+}
+
+object P {
+  val m = Q.bar(new B)
+}
+
+object Q {
+  def bar(b: B) = b.a.foo()
+}
+