Merge RFC #469 -- feature-gate-box-patterns by @jakub-

Author: nikomatsakis

README.md

@@ -56,6 +56,7 @@ the direction the language is evolving in.
 * [0438-precedence-of-plus.md](text/0438-precedence-of-plus.md)
 * [0439-cmp-ops-reform.md](text/0439-cmp-ops-reform.md)
 * [0446--es6-unicode-escapes.md](text/0446-es6-unicode-escapes.md)
+* [0469-feature-gate-box-patterns.md](text/0469-feature-gate-box-patterns.md)
 * [0450-un-feature-gate-some-more-gates.md](text/0450-un-feature-gate-some-more-gates.md)
 * [0453-macro-reform.md](text/0453-macro-reform.md)
 * [0459-disallow-shadowing.md](text/0459-disallow-shadowing.md)

text/0000-feature-gate-box-patterns.md renamed to text/0469-feature-gate-box-patterns.md

@@ -1,6 +1,6 @@
 - Start Date: 2014-11-17
-- RFC PR: (leave this empty)
-- Rust Issue: (leave this empty)
+- RFC PR: [rust-lang/rfcs#469](https://github.com/rust-lang/rfcs/pull/469)
+- Rust Issue: [rust-lang/rust#21931](https://github.com/rust-lang/rust/issues/21931)
 
 # Summary