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, 4 insertions, 4 deletions

diff --git a/src/librustdoc/html/render.rs b/src/librustdoc/html/render.rs
index ab9700d966a..bd2213910be 100644
--- a/src/librustdoc/html/render.rs
+++ b/src/librustdoc/html/render.rs
@@ -1351,7 +1351,7 @@ impl<'a> Item<'a> {
 }
 
 
-impl<'a> fmt::String for Item<'a> {
+impl<'a> fmt::Display for Item<'a> {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
         // Write the breadcrumb trail header for the top
         try!(write!(fmt, "\n<h1 class='fqn'><span class='in-band'>"));
@@ -1626,7 +1626,7 @@ fn item_module(w: &mut fmt::Formatter, cx: &Context,
 
 struct Initializer<'a>(&'a str);
 
-impl<'a> fmt::String for Initializer<'a> {
+impl<'a> fmt::Display for Initializer<'a> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let Initializer(s) = *self;
         if s.len() == 0 { return Ok(()); }
@@ -2188,7 +2188,7 @@ fn item_typedef(w: &mut fmt::Formatter, it: &clean::Item,
     document(w, it)
 }
 
-impl<'a> fmt::String for Sidebar<'a> {
+impl<'a> fmt::Display for Sidebar<'a> {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
         let cx = self.cx;
         let it = self.item;
@@ -2243,7 +2243,7 @@ impl<'a> fmt::String for Sidebar<'a> {
     }
 }
 
-impl<'a> fmt::String for Source<'a> {
+impl<'a> fmt::Display for Source<'a> {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
         let Source(s) = *self;
         let lines = s.lines().count();