core: Comments only -- move FIXME to correct location

src/libcore/os.rs

@@ -43,8 +43,6 @@ use vec;
 pub use libc::fclose;
 pub use os::consts::*;
 
-// FIXME: move these to str perhaps? #2620
-
 pub fn close(fd: c_int) -> c_int {
     unsafe {
         libc::close(fd)
@@ -79,6 +77,8 @@ pub fn getcwd() -> Path {
     }
 }
 
+// FIXME: move these to str perhaps? #2620
+
 pub fn as_c_charp<T>(s: &str, f: &fn(*c_char) -> T) -> T {
     str::as_c_str(s, |b| f(b as *c_char))
 }