---

yaml
---
r: 262395
b: refs/heads/snap-stage3
c: 8fa4857
h: refs/heads/master
i:
  262393: 2d0a601
  262391: 0e9b20a

Author: steveklabnik

[refs]

@@ -1,6 +1,6 @@
 ---
 refs/heads/master: 5a0308abadce38396f27122d5c8639ffb2a21469
-refs/heads/snap-stage3: 4ebc47bad2d50138e981d403000cf311c760169c
+refs/heads/snap-stage3: 8fa48573e15b50971c8f20bea1250407ea3f586c
 refs/heads/try: 29d24a3b02cb805da19450bf9830a8f0a6bd859c
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/tags/release-0.2: c870d2dffb391e14efb05aa27898f1f6333a9596

branches/snap-stage3/src/libstd/primitive_docs.rs

@@ -366,6 +366,9 @@ mod prim_str { }
 /// ("hello", 5, 'c');
 /// ```
 ///
+/// 'Length' is also sometimes called 'arity' here; each tuple of a different
+/// length is a different, distinct type.
+///
 /// Tuples are *heterogeneous*. This means that each element of the tuple can
 /// have a different type. In that tuple above, it has the type:
 ///
@@ -409,6 +412,9 @@ mod prim_str { }
 /// [`Default`]: ../default/trait.Default.html
 /// [`Hash`]: ../hash/trait.Hash.html
 ///
+/// Due to a temporary restriction in Rust's type system, these traits are only
+/// implemented on tuples of arity 32 or less. In the future, this may change.
+///
 /// # Examples
 ///
 /// Basic usage: