continue to annotate functions as unsafe where neccessary

src/test/stdtest/ptr.rs

@@ -5,7 +5,7 @@ import std::unsafe;
 type pair = {mutable fst: int, mutable snd: int};
 
 #[test]
-fn test() {
+fn test() unsafe {
     let p = {mutable fst: 10, mutable snd: 20};
     let pptr: *mutable pair = ptr::addr_of(p);
     let iptr: *mutable int = unsafe::reinterpret_cast(pptr);