deal with windows

src/test/run-pass/deriving-meta-empty-trait-list.rs

@@ -10,6 +10,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// xfail-fast
+
 #[deriving]   //~ WARNING empty trait list in `deriving`
 struct Foo;
 

src/test/run-pass/issue-4241.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// xfail-fast
+
 extern mod extra;
 
 use extra::net::tcp::TcpSocketBuf;

src/test/run-pass/issue-4541.rs

@@ -11,7 +11,7 @@
 use std::io;
 
 fn parse_args() -> ~str {
-    let args = std::os::args();
+    let args = ::std::os::args();
     let mut n = 0;
 
     while n < args.len() {