Commits on Dec 5, 2014

1. librustc: Make Copy opt-in. …

   This change makes the compiler no longer infer whether types (structures
   and enumerations) implement the `Copy` trait (and thus are implicitly
   copyable). Rather, you must implement `Copy` yourself via `impl Copy for
   MyType {}`.
   
   A new warning has been added, `missing_copy_implementations`, to warn
   you if a non-generic public type has been added that could have
   implemented `Copy` but didn't.
   
   This breaks code like:
   
       #[deriving(Show)]
       struct Point2D {
           x: int,
           y: int,
       }
   
       fn main() {
           let mypoint = Point2D {
               x: 1,
               y: 1,
           };
           let otherpoint = mypoint;
           println!("{}{}", mypoint, otherpoint);
       }
   
   Change this code to:
   
       #[deriving(Show)]
       struct Point2D {
           x: int,
           y: int,
       }
   
       impl Copy for Point2D {}
   
       fn main() {
           let mypoint = Point2D {
               x: 1,
               y: 1,
           };
           let otherpoint = mypoint;
           println!("{}{}", mypoint, otherpoint);
       }
   
   This is the backwards-incompatible part of rust-lang#13231.
   
   Part of RFC rust-lang#3.
   
   [breaking-change]

   

   pcwalton committed Dec 5, 2014
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