RFC 1789 is Conversions from &mut T to &Cell<T>

Author: aturon

text/0000-as-cell.md renamed to text/1789-as-cell.md

@@ -1,7 +1,7 @@
 - Feature Name: as_cell
 - Start Date: 2016-11-13
-- RFC PR: (leave this empty)
-- Rust Issue: (leave this empty)
+- RFC PR: https://github.com/rust-lang/rfcs/pull/1789
+- Rust Issue: https://github.com/rust-lang/rust/issues/43038
 
 # Summary
 [summary]: #summary