spin-off rustdocs tuple code to libstd

src/libstd/std.rc

@@ -12,7 +12,7 @@ export c_vec, four, tri, util;
 export bitv, deque, fun_treemap, list, map, smallintmap, sort, treemap, ufind;
 export rope;
 export ebml, dbg, getopts, json, rand, sha1, term, time;
-export extfmt, test, tempfile;
+export extfmt, test, tempfile, tuple;
 // FIXME: generic_os and os_fs shouldn't be exported
 export generic_os, os, os_fs;
 
@@ -61,6 +61,7 @@ mod md4;
 mod tempfile;
 mod term;
 mod time;
+mod tuple;
 
 #[cfg(unicode)]
 mod unicode;

src/libstd/tuple.rs

@@ -0,0 +1,28 @@
+/*
+Module: tuple
+*/
+
+// FIXME #1546: Would rather write fst<T, U>(+pair: (T, U)) -> T
+fn first<T:copy, U:copy>(pair: (T, U)) -> T {
+    let (t, _) = pair;
+    ret t;
+}
+
+fn second<T:copy, U:copy>(pair: (T, U)) -> U {
+    let (_, u) = pair;
+    ret u;
+}
+
+fn swap<T:copy, U:copy>(pair: (T, U)) -> (U, T) {
+    let (t, u) = pair;
+    ret (u, t);
+}
+
+
+#[test]
+fn test_tuple() {
+    assert first((948, 4039.48)) == 948;
+    assert second((34.5, "foo")) == "foo";
+    assert swap(('a', 2)) == (2, 'a');
+}
+

src/rustdoc/attr_parser.rs

@@ -1,5 +1,6 @@
 import rustc::syntax::ast;
 import rustc::front::attr;
+import std::tuple;
 
 export fn_attrs, arg_attrs;
 export parse_fn;
@@ -83,8 +84,8 @@ fn parse_fn_(
         vec::filter_map(items) {|item|
             option::map(attr::name_value_str_pair(item)) { |pair|
                 {
-                    name: util::fst(pair),
-                    desc: util::snd(pair)
+                    name: tuple::first(pair),
+                    desc: tuple::second(pair)
                 }
             }
         }
@@ -172,4 +173,4 @@ mod tests {
         assert attrs.args[0] == {name: "a", desc: "arg a"};
         assert attrs.args[1] == {name: "b", desc: "arg b"};
     }
-}
+}

src/rustdoc/util.rs

@@ -1,10 +0,0 @@
-// FIXME #1546: Would rather write fst<T, U>(+pair: (T, U)) -> T
-fn fst<T:copy, U:copy>(pair: (T, U)) -> T {
-    let (t, _) = pair;
-    ret t;
-}
-
-fn snd<T:copy, U:copy>(pair: (T, U)) -> U {
-    let (_, u) = pair;
-    ret u;
-}