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| author | Steve Klabnik <steve@steveklabnik.com> | 2016-02-09 13:33:02 -0500 |
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| committer | Steve Klabnik <steve@steveklabnik.com> | 2016-02-09 16:00:54 -0500 |
| commit | 8fa48573e15b50971c8f20bea1250407ea3f586c (patch) | |
| tree | 67ed5290b3f20adf0c2133ca455f7132460a668f /src/libstd | |
| parent | 4ebc47bad2d50138e981d403000cf311c760169c (diff) | |
| download | rust-8fa48573e15b50971c8f20bea1250407ea3f586c.tar.gz rust-8fa48573e15b50971c8f20bea1250407ea3f586c.zip | |
make note of arity and 32-length restriction
Diffstat (limited to 'src/libstd')
| -rw-r--r-- | src/libstd/primitive_docs.rs | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/libstd/primitive_docs.rs b/src/libstd/primitive_docs.rs index 2be8c41a496..ad93fe0094a 100644 --- a/src/libstd/primitive_docs.rs +++ b/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: |