Xfail broken tests

doc/rust.md

@@ -2704,7 +2704,7 @@ The special type `self` has a meaning within methods inside an
 impl item. It refers to the type of the implicit `self` argument. For
 example, in:
 
-~~~~~~
+~~~~~~~~{.xfail-test}
 trait Printable {
   fn to_str() -> ~str;
 }
@@ -2712,7 +2712,7 @@ trait Printable {
 impl ~str: Printable {
   fn to_str() -> ~str { copy self }
 }
-~~~~~~
+~~~~~~~~
 
 `self` refers to the value of type `~str` that is the receiver for a
 call to the method `to_str`.

src/test/bench/shootout-nbody.rs

@@ -1,3 +1,4 @@
+// xfail-test
 // based on:
 // http://shootout.alioth.debian.org/u32/benchmark.php?test=nbody&lang=java
 

src/test/run-pass/stat.rs

@@ -1,3 +1,4 @@
+// xfail-test
 extern mod std;
 use io::WriterUtil;
 use std::tempfile;