syntax: Implement #![no_core]

This commit is an implementation of [RFC 1184][rfc] which tweaks the behavior of
the `#![no_std]` attribute and adds a new `#![no_core]` attribute. The
`#![no_std]` attribute now injects `extern crate core` at the top of the crate
as well as the libcore prelude into all modules (in the same manner as the
standard library's prelude). The `#![no_core]` attribute disables both std and
core injection.

[rfc]: https://github.com/rust-lang/rfcs/pull/1184

3 files changed, 3 insertions, 3 deletions

diff --git a/src/libcore/fmt/builders.rs b/src/libcore/fmt/builders.rs
index 22f0215f0ad..39a067c1608 100644
--- a/src/libcore/fmt/builders.rs
+++ b/src/libcore/fmt/builders.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use prelude::*;
+use prelude::v1::*;
 use fmt::{self, Write, FlagV1};
 
 struct PadAdapter<'a, 'b: 'a> {
diff --git a/src/libcore/fmt/mod.rs b/src/libcore/fmt/mod.rs
index 02b23c6c7e7..668e2ecf1c6 100644
--- a/src/libcore/fmt/mod.rs
+++ b/src/libcore/fmt/mod.rs
@@ -12,7 +12,7 @@
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
-use prelude::*;
+use prelude::v1::*;
 
 use cell::{Cell, RefCell, Ref, RefMut, BorrowState};
 use marker::PhantomData;
diff --git a/src/libcore/fmt/num.rs b/src/libcore/fmt/num.rs
index 7cacc6af575..bffbb789f22 100644
--- a/src/libcore/fmt/num.rs
+++ b/src/libcore/fmt/num.rs
@@ -12,7 +12,7 @@
 
 // FIXME: #6220 Implement floating point formatting
 
-use prelude::*;
+use prelude::v1::*;
 
 use fmt;
 use num::Zero;