std: Rename Show/String to Debug/Display

This commit is an implementation of [RFC 565][rfc] which is a stabilization of
the `std::fmt` module and the implementations of various formatting traits.
Specifically, the following changes were performed:

[rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0565-show-string-guidelines.md

* The `Show` trait is now deprecated, it was renamed to `Debug`
* The `String` trait is now deprecated, it was renamed to `Display`
* Many `Debug` and `Display` implementations were audited in accordance with the
  RFC and audited implementations now have the `#[stable]` attribute
  * Integers and floats no longer print a suffix
  * Smart pointers no longer print details that they are a smart pointer
  * Paths with `Debug` are now quoted and escape characters
* The `unwrap` methods on `Result` now require `Display` instead of `Debug`
* The `Error` trait no longer has a `detail` method and now requires that
  `Display` must be implemented. With the loss of `String`, this has moved into
  libcore.
* `impl<E: Error> FromError<E> for Box<Error>` now exists
* `derive(Show)` has been renamed to `derive(Debug)`. This is not currently
  warned about due to warnings being emitted on stage1+

While backwards compatibility is attempted to be maintained with a blanket
implementation of `Display` for the old `String` trait (and the same for
`Show`/`Debug`) this is still a breaking change due to primitives no longer
implementing `String` as well as modifications such as `unwrap` and the `Error`
trait. Most code is fairly straightforward to update with a rename or tweaks of
method calls.

[breaking-change]
Closes #21436

1 files changed, 6 insertions, 6 deletions

diff --git a/src/libcollections/slice.rs b/src/libcollections/slice.rs
index 988ec4c661f..82966727037 100644
--- a/src/libcollections/slice.rs
+++ b/src/libcollections/slice.rs
@@ -2476,19 +2476,19 @@ mod tests {
         }
         let empty: Vec<int> = vec![];
         test_show_vec!(empty, "[]");
-        test_show_vec!(vec![1i], "[1i]");
-        test_show_vec!(vec![1i, 2, 3], "[1i, 2i, 3i]");
+        test_show_vec!(vec![1i], "[1]");
+        test_show_vec!(vec![1i, 2, 3], "[1, 2, 3]");
         test_show_vec!(vec![vec![], vec![1u], vec![1u, 1u]],
-                       "[[], [1u], [1u, 1u]]");
+                       "[[], [1], [1, 1]]");
 
         let empty_mut: &mut [int] = &mut[];
         test_show_vec!(empty_mut, "[]");
         let v: &mut[int] = &mut[1];
-        test_show_vec!(v, "[1i]");
+        test_show_vec!(v, "[1]");
         let v: &mut[int] = &mut[1, 2, 3];
-        test_show_vec!(v, "[1i, 2i, 3i]");
+        test_show_vec!(v, "[1, 2, 3]");
         let v: &mut [&mut[uint]] = &mut[&mut[], &mut[1u], &mut[1u, 1u]];
-        test_show_vec!(v, "[[], [1u], [1u, 1u]]");
+        test_show_vec!(v, "[[], [1], [1, 1]]");
     }
 
     #[test]