auto merge of #8069 : erickt/rust/maikklein, r=erickt

Good evening,

This is a superset of @MaikKlein's #7969 commit, that I've fixed up to compile. I had a couple commits I wanted to do on top of @MaikKlein's work that I didn't want to bitrot.

src/test/bench/core-std.rs

@@ -75,7 +75,7 @@ fn read_line() {
         .push_rel(&Path("src/test/bench/shootout-k-nucleotide.data"));
 
     for int::range(0, 3) |_i| {
-        let reader = result::unwrap(io::file_reader(&path));
+        let reader = io::file_reader(&path).unwrap();
         while !reader.eof() {
             reader.read_line();
         }

src/test/bench/shootout-fasta.rs

@@ -124,8 +124,8 @@ fn main() {
     };
 
     let writer = if os::getenv("RUST_BENCH").is_some() {
-        result::unwrap(io::file_writer(&Path("./shootout-fasta.data"),
-                                       [io::Truncate, io::Create]))
+        io::file_writer(&Path("./shootout-fasta.data"),
+                        [io::Truncate, io::Create]).unwrap()
     } else {
         io::stdout()
     };

src/test/bench/shootout-k-nucleotide-pipes.rs

@@ -161,7 +161,7 @@ fn main() {
        // get to this massive data set, but include_bin! chokes on it (#2598)
        let path = Path(env!("CFG_SRC_DIR"))
            .push_rel(&Path("src/test/bench/shootout-k-nucleotide.data"));
-       result::unwrap(io::file_reader(&path))
+       io::file_reader(&path).unwrap()
    } else {
       io::stdin()
    };