Auto merge of #24428 - kwantam:deprecate_unicode_fns, r=alexcrichton

This patch
1. renames libunicode to librustc_unicode,
2. deprecates several pieces of libunicode (see below), and
3. removes references to deprecated functions from
   librustc_driver and libsyntax. This may change pretty-printed
   output from these modules in cases involving wide or combining
   characters used in filenames, identifiers, etc.

The following functions are marked deprecated:

1. char.width() and str.width():
   --> use unicode-width crate

2. str.graphemes() and str.grapheme_indices():
   --> use unicode-segmentation crate

3. str.nfd_chars(), str.nfkd_chars(), str.nfc_chars(), str.nfkc_chars(),
   char.compose(), char.decompose_canonical(), char.decompose_compatible(),
   char.canonical_combining_class():
   --> use unicode-normalization crate

1 files changed, 2 insertions, 2 deletions

diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index b2bcbaa7b1c..4452a4457ac 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -151,7 +151,7 @@ extern crate collections as core_collections;
 
 #[allow(deprecated)] extern crate rand as core_rand;
 extern crate alloc;
-extern crate unicode;
+extern crate rustc_unicode;
 extern crate libc;
 
 #[macro_use] #[no_link] extern crate rustc_bitflags;
@@ -196,7 +196,7 @@ pub use core_collections::string;
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core_collections::vec;
 
-pub use unicode::char;
+pub use rustc_unicode::char;
 
 /* Exported macros */