libcore: Fix core test. rs=broken

src/libcore/os.rs

@@ -1233,6 +1233,7 @@ mod tests {
 
     #[test]
     fn copy_file_ok() {
+        unsafe {
           let tempdir = getcwd(); // would like to use $TMPDIR,
                                   // doesn't seem to work on Linux
           assert (str::len(tempdir.to_str()) > 0u);
@@ -1263,4 +1264,5 @@ mod tests {
           assert (remove_file(&in));
           assert (remove_file(&out));
         }
+    }
 }

src/libcore/str.rs

@@ -2674,10 +2674,12 @@ mod tests {
 
     #[test]
     fn test_to_lower() {
+        unsafe {
             assert ~"" == map(~"", |c| libc::tolower(c as c_char) as char);
             assert ~"ymca" == map(~"YMCA",
                                  |c| libc::tolower(c as c_char) as char);
         }
+    }
 
     #[test]
     fn test_unsafe_slice() {
@@ -3192,10 +3194,12 @@ mod tests {
 
     #[test]
     fn test_map() {
+        unsafe {
             assert ~"" == map(~"", |c| libc::toupper(c as c_char) as char);
             assert ~"YMCA" == map(~"ymca",
                                   |c| libc::toupper(c as c_char) as char);
         }
+    }
 
     #[test]
     fn test_all() {

src/libcore/task/mod.rs

@@ -957,6 +957,7 @@ extern mod testrt {
 
 #[test]
 fn test_spawn_sched_blocking() {
+    unsafe {
 
         // Testing that a task in one scheduler can block in foreign code
         // without affecting other schedulers
@@ -1011,6 +1012,7 @@ fn test_spawn_sched_blocking() {
             oldcomm::recv(fin_po);
             testrt::rust_dbg_lock_destroy(lock);
         }
+    }
 }
 
 #[cfg(test)]