From 3ba7e041f10f1e955120c33f5aab0817e02c5222 Mon Sep 17 00:00:00 2001
From: Tim Chevalier <chevalier@alum.wellesley.edu>
Date: Tue, 26 Mar 2013 16:08:05 -0700
Subject: [PATCH] core: As per #4898, finish impls for one-tuples

---
 src/libcore/repr.rs   |  5 ++++-
 src/libcore/to_str.rs | 11 ++++++++++-
 src/libcore/tuple.rs  | 40 +++++++++++++++++++++++++++++++++++++++-
 3 files changed, 53 insertions(+), 3 deletions(-)

diff --git a/src/libcore/repr.rs b/src/libcore/repr.rs
index 39cc986f77252..5277ba32614a3 100644
--- a/src/libcore/repr.rs
+++ b/src/libcore/repr.rs
@@ -451,6 +451,9 @@ impl TyVisitor for ReprVisitor {
     }
     fn visit_leave_tup(&self, _n_fields: uint,
                        _sz: uint, _align: uint) -> bool {
+        if _n_fields == 1 {
+            self.writer.write_char(',');
+        }
         self.writer.write_char(')');
         true
     }
@@ -591,7 +594,6 @@ fn test_repr() {
         fail_unless!(s == e);
     }
 
-
     exact_test(&10, "10");
     exact_test(&true, "true");
     exact_test(&false, "false");
@@ -608,6 +610,7 @@ fn test_repr() {
     let mut x = 10;
     exact_test(&(&mut x), "&mut 10");
 
+    exact_test(&(1,), "(1,)");
     exact_test(&(@[1,2,3,4,5,6,7,8]),
                "@[1, 2, 3, 4, 5, 6, 7, 8]");
     exact_test(&(@[1u8,2u8,3u8,4u8]),
diff --git a/src/libcore/to_str.rs b/src/libcore/to_str.rs
index 576f794483d20..c942f508be841 100644
--- a/src/libcore/to_str.rs
+++ b/src/libcore/to_str.rs
@@ -29,7 +29,16 @@ impl ToStr for () {
     fn to_str(&self) -> ~str { ~"()" }
 }
 
-// FIXME #4898: impl for one-tuples
+impl<A:ToStr> ToStr for (A,) {
+    #[inline(always)]
+    fn to_str(&self) -> ~str {
+        match *self {
+            (ref a,) => {
+                ~"(" + a.to_str() + ~", " + ~")"
+            }
+        }
+    }
+}
 
 impl<A:ToStr,B:ToStr> ToStr for (A, B) {
     #[inline(always)]
diff --git a/src/libcore/tuple.rs b/src/libcore/tuple.rs
index fc7834a7514ac..1762c2c64262c 100644
--- a/src/libcore/tuple.rs
+++ b/src/libcore/tuple.rs
@@ -112,7 +112,45 @@ impl<A:Copy,B:Copy> ExtendedTupleOps<A,B> for (~[A], ~[B]) {
     }
 }
 
-// FIXME #4898: impl for one-tuples
+#[cfg(notest)]
+impl<A:Eq> Eq for (A,) {
+    #[inline(always)]
+    fn eq(&self, other: &(A,)) -> bool {
+        match (*self) {
+            (ref self_a,) => match other {
+                &(ref other_a,) => {
+                    (*self_a).eq(other_a)
+                }
+            }
+        }
+    }
+    #[inline(always)]
+    fn ne(&self, other: &(A,)) -> bool { !(*self).eq(other) }
+}
+
+#[cfg(notest)]
+impl<A:Ord> Ord for (A,) {
+    #[inline(always)]
+    fn lt(&self, other: &(A,)) -> bool {
+        match (*self) {
+            (ref self_a,) => {
+                match (*other) {
+                    (ref other_a,) => {
+                        if (*self_a).lt(other_a) { return true; }
+                        return false;
+                    }
+                }
+            }
+        }
+    }
+    #[inline(always)]
+    fn le(&self, other: &(A,)) -> bool { !other.lt(&(*self)) }
+    #[inline(always)]
+    fn ge(&self, other: &(A,)) -> bool { !self.lt(other) }
+    #[inline(always)]
+    fn gt(&self, other: &(A,)) -> bool { other.lt(&(*self))  }
+}
+
 
 #[cfg(notest)]
 impl<A:Eq,B:Eq> Eq for (A, B) {