diff --git a/src/Cargo.lock b/src/Cargo.lock
index a60679e417a..6e7c4b67acf 100644
--- a/src/Cargo.lock
+++ b/src/Cargo.lock
@@ -13,7 +13,6 @@ dependencies = [
  "compiler_builtins 0.0.0",
  "core 0.0.0",
  "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "std_unicode 0.0.0",
 ]
 
 [[package]]
diff --git a/src/ci/docker/wasm32-unknown/Dockerfile b/src/ci/docker/wasm32-unknown/Dockerfile
index 6c0ec1ad9d4..853923ad947 100644
--- a/src/ci/docker/wasm32-unknown/Dockerfile
+++ b/src/ci/docker/wasm32-unknown/Dockerfile
@@ -34,4 +34,3 @@ ENV SCRIPT python2.7 /checkout/x.py test --target $TARGETS \
   src/test/mir-opt \
   src/test/codegen-units \
   src/libcore \
-  src/libstd_unicode/ \
diff --git a/src/doc/unstable-book/src/language-features/lang-items.md b/src/doc/unstable-book/src/language-features/lang-items.md
index c5167418614..6a7aea7f1c2 100644
--- a/src/doc/unstable-book/src/language-features/lang-items.md
+++ b/src/doc/unstable-book/src/language-features/lang-items.md
@@ -243,7 +243,7 @@ the source code.
   - `usize`: `libcore/num/mod.rs`
   - `f32`: `libstd/f32.rs`
   - `f64`: `libstd/f64.rs`
-  - `char`: `libstd_unicode/char.rs`
+  - `char`: `libcore/char.rs`
   - `slice`: `liballoc/slice.rs`
   - `str`: `liballoc/str.rs`
   - `const_ptr`: `libcore/ptr.rs`
diff --git a/src/liballoc/Cargo.toml b/src/liballoc/Cargo.toml
index 2eb8ea12604..6383bd1e941 100644
--- a/src/liballoc/Cargo.toml
+++ b/src/liballoc/Cargo.toml
@@ -9,7 +9,6 @@ path = "lib.rs"
 
 [dependencies]
 core = { path = "../libcore" }
-std_unicode = { path = "../libstd_unicode" }
 compiler_builtins = { path = "../rustc/compiler_builtins_shim" }
 
 [dev-dependencies]
diff --git a/src/liballoc/lib.rs b/src/liballoc/lib.rs
index b08bd66b47c..d1a91ab4a9c 100644
--- a/src/liballoc/lib.rs
+++ b/src/liballoc/lib.rs
@@ -135,8 +135,6 @@ extern crate test;
 #[cfg(test)]
 extern crate rand;
 
-extern crate std_unicode;
-
 // Module with internal macros used by other modules (needs to be included before other modules).
 #[macro_use]
 mod macros;
diff --git a/src/liballoc/str.rs b/src/liballoc/str.rs
index d5ef41df0d8..eaca9eb49f9 100644
--- a/src/liballoc/str.rs
+++ b/src/liballoc/str.rs
@@ -45,12 +45,11 @@ use core::str::pattern::{Searcher, ReverseSearcher, DoubleEndedSearcher};
 use core::mem;
 use core::ptr;
 use core::iter::FusedIterator;
-use std_unicode::str::{UnicodeStr, Utf16Encoder};
+use core::unicode::str::{UnicodeStr, Utf16Encoder};
 
 use vec_deque::VecDeque;
 use borrow::{Borrow, ToOwned};
 use string::String;
-use std_unicode;
 use vec::Vec;
 use slice::{SliceConcatExt, SliceIndex};
 use boxed::Box;
@@ -75,7 +74,7 @@ pub use core::str::{from_utf8, from_utf8_mut, Chars, CharIndices, Bytes};
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::str::{from_utf8_unchecked, from_utf8_unchecked_mut, ParseBoolError};
 #[stable(feature = "rust1", since = "1.0.0")]
-pub use std_unicode::str::SplitWhitespace;
+pub use core::unicode::str::SplitWhitespace;
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::str::pattern;
 
@@ -1960,7 +1959,7 @@ impl str {
         }
 
         fn case_ignoreable_then_cased<I: Iterator<Item = char>>(iter: I) -> bool {
-            use std_unicode::derived_property::{Cased, Case_Ignorable};
+            use core::unicode::derived_property::{Cased, Case_Ignorable};
             match iter.skip_while(|&c| Case_Ignorable(c)).next() {
                 Some(c) => Cased(c),
                 None => false,
diff --git a/src/liballoc/string.rs b/src/liballoc/string.rs
index 5f90e28cb3c..a902f0bb06b 100644
--- a/src/liballoc/string.rs
+++ b/src/liballoc/string.rs
@@ -64,7 +64,7 @@ use core::ops::{self, Add, AddAssign, Index, IndexMut, RangeBounds};
 use core::ptr;
 use core::str::pattern::Pattern;
 use core::str::lossy;
-use std_unicode::char::{decode_utf16, REPLACEMENT_CHARACTER};
+use core::unicode::char::{decode_utf16, REPLACEMENT_CHARACTER};
 
 use borrow::{Cow, ToOwned};
 use str::{self, from_boxed_utf8_unchecked, FromStr, Utf8Error, Chars};
diff --git a/src/liballoc/tests/lib.rs b/src/liballoc/tests/lib.rs
index 17f1d0464a5..fddf341d0d1 100644
--- a/src/liballoc/tests/lib.rs
+++ b/src/liballoc/tests/lib.rs
@@ -29,7 +29,7 @@
 #![feature(inclusive_range_fields)]
 
 extern crate alloc_system;
-extern crate std_unicode;
+extern crate core;
 extern crate rand;
 
 use std::hash::{Hash, Hasher};
diff --git a/src/liballoc/tests/str.rs b/src/liballoc/tests/str.rs
index a14a5d32738..763dbe675b9 100644
--- a/src/liballoc/tests/str.rs
+++ b/src/liballoc/tests/str.rs
@@ -1204,7 +1204,7 @@ fn test_rev_split_char_iterator_no_trailing() {
 
 #[test]
 fn test_utf16_code_units() {
-    use std_unicode::str::Utf16Encoder;
+    use core::unicode::str::Utf16Encoder;
     assert_eq!(Utf16Encoder::new(vec!['é', '\u{1F4A9}'].into_iter()).collect::<Vec<u16>>(),
                [0xE9, 0xD83D, 0xDCA9])
 }
diff --git a/src/liballoc/tests/string.rs b/src/liballoc/tests/string.rs
index cb4a17a22d8..33f20be100d 100644
--- a/src/liballoc/tests/string.rs
+++ b/src/liballoc/tests/string.rs
@@ -132,7 +132,7 @@ fn test_from_utf16() {
         let s_as_utf16 = s.encode_utf16().collect::<Vec<u16>>();
         let u_as_string = String::from_utf16(&u).unwrap();
 
-        assert!(::std_unicode::char::decode_utf16(u.iter().cloned()).all(|r| r.is_ok()));
+        assert!(::core::unicode::char::decode_utf16(u.iter().cloned()).all(|r| r.is_ok()));
         assert_eq!(s_as_utf16, u);
 
         assert_eq!(u_as_string, s);
diff --git a/src/libcore/char.rs b/src/libcore/char.rs
index b5554a59db5..6e2626cc362 100644
--- a/src/libcore/char.rs
+++ b/src/libcore/char.rs
@@ -10,7 +10,7 @@
 
 //! Character manipulation.
 //!
-//! For more details, see ::std_unicode::char (a.k.a. std::char)
+//! For more details, see ::core::unicode::char (a.k.a. std::char)
 
 #![allow(non_snake_case)]
 #![stable(feature = "core_char", since = "1.2.0")]
diff --git a/src/librustdoc/lib.rs b/src/librustdoc/lib.rs
index 730f61e0aa6..9ac034869ac 100644
--- a/src/librustdoc/lib.rs
+++ b/src/librustdoc/lib.rs
@@ -41,7 +41,6 @@ extern crate serialize;
 #[macro_use] extern crate syntax;
 extern crate syntax_pos;
 extern crate test as testing;
-extern crate std_unicode;
 #[macro_use] extern crate log;
 extern crate rustc_errors as errors;
 extern crate pulldown_cmark;
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index 672723341eb..16bca9ddcd3 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -354,7 +354,6 @@ extern crate core as __core;
 #[macro_reexport(vec, format)]
 extern crate alloc;
 extern crate alloc_system;
-extern crate std_unicode;
 #[doc(masked)]
 extern crate libc;
 
@@ -455,7 +454,7 @@ pub use alloc::string;
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use alloc::vec;
 #[stable(feature = "rust1", since = "1.0.0")]
-pub use std_unicode::char;
+pub use core::unicode::char;
 #[stable(feature = "i128", since = "1.26.0")]
 pub use core::u128;
 
diff --git a/src/libstd_unicode/lib.rs b/src/libstd_unicode/lib.rs
index 8cdeb6c8ad1..29de017c64d 100644
--- a/src/libstd_unicode/lib.rs
+++ b/src/libstd_unicode/lib.rs
@@ -31,5 +31,6 @@
 
 #![feature(unicode)]
 #![feature(staged_api)]
+#![rustc_deprecated(since = "1.27.0", reason = "moved into libcore")]
 
 pub use core::unicode::*;
diff --git a/src/libsyntax/lib.rs b/src/libsyntax/lib.rs
index d80430f609b..9de905c01d6 100644
--- a/src/libsyntax/lib.rs
+++ b/src/libsyntax/lib.rs
@@ -32,9 +32,9 @@
 extern crate rustc_cratesio_shim;
 
 #[macro_use] extern crate bitflags;
+extern crate core;
 extern crate serialize;
 #[macro_use] extern crate log;
-extern crate std_unicode;
 pub extern crate rustc_errors as errors;
 extern crate syntax_pos;
 extern crate rustc_data_structures;
diff --git a/src/libsyntax/parse/lexer/mod.rs b/src/libsyntax/parse/lexer/mod.rs
index 39b2f77f230..cb3323c7eca 100644
--- a/src/libsyntax/parse/lexer/mod.rs
+++ b/src/libsyntax/parse/lexer/mod.rs
@@ -15,7 +15,7 @@ use errors::{FatalError, DiagnosticBuilder};
 use parse::{token, ParseSess};
 use str::char_at;
 use symbol::{Symbol, keywords};
-use std_unicode::property::Pattern_White_Space;
+use core::unicode::property::Pattern_White_Space;
 
 use std::borrow::Cow;
 use std::char;