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make note of arity and 32-length restriction

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Steve Klabnik 2016-02-09 13:33:02 -05:00
parent 4ebc47bad2
commit 8fa48573e1
1 changed files with 6 additions and 0 deletions
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6
src/libstd/primitive_docs.rs
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@ -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: