update doc and add test for SystemExit.new.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33985 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

error.c

@@ -743,9 +743,13 @@ exc_equal(VALUE exc, VALUE obj)
 
 /*
  * call-seq:
- *   SystemExit.new(status=0)   -> system_exit
+ *   SystemExit.new              -> system_exit
+ *   SystemExit.new(status)      -> system_exit
+ *   SystemExit.new(status, msg) -> system_exit
+ *   SystemExit.new(msg)         -> system_exit
  *
- * Create a new +SystemExit+ exception with the given status.
+ * Create a new +SystemExit+ exception with the given status and message.
+ * If status is not given, EXIT_SUCCESS is used.
  */
 
 static VALUE

test/ruby/test_exception.rb

@@ -334,4 +334,19 @@ end.join
     arg_string = (0...140000).to_a.join(", ")
     assert_raise(SystemStackError, bug5720) {eval "raise(#{arg_string})"}
   end
+
+  def test_systemexit_new
+    e0 = SystemExit.new
+    assert_equal(0, e0.status)
+    assert_equal("SystemExit", e0.message)
+    ei = SystemExit.new(3)
+    assert_equal(3, ei.status)
+    assert_equal("SystemExit", ei.message)
+    es = SystemExit.new("msg")
+    assert_equal(0, es.status)
+    assert_equal("msg", es.message)
+    eis = SystemExit.new(7, "msg")
+    assert_equal(7, eis.status)
+    assert_equal("msg", eis.message)
+  end
 end