Utilize fewer reexports

In regards to:

https://github.com/rust-lang/rust/issues/19253#issuecomment-64836729

This commit:

* Changes the #deriving code so that it generates code that utilizes fewer
  reexports (in particur Option::* and Result::*), which is necessary to
  remove those reexports in the future
* Changes other areas of the codebase so that fewer reexports are utilized

14 files changed, 54 insertions, 32 deletions

diff --git a/src/libcore/any.rs b/src/libcore/any.rs
index 5d1f996831e..75feb4d8828 100644
--- a/src/libcore/any.rs
+++ b/src/libcore/any.rs
@@ -72,7 +72,8 @@
 #![stable]
 
 use mem::{transmute};
-use option::{Option, Some, None};
+use option::Option;
+use option::Option::{Some, None};
 use raw::TraitObject;
 use intrinsics::TypeId;
 
diff --git a/src/libcore/cell.rs b/src/libcore/cell.rs
index ed4df101202..1ec2efaf801 100644
--- a/src/libcore/cell.rs
+++ b/src/libcore/cell.rs
@@ -160,7 +160,8 @@ use cmp::PartialEq;
 use default::Default;
 use kinds::{marker, Copy};
 use ops::{Deref, DerefMut, Drop};
-use option::{None, Option, Some};
+use option::Option;
+use option::Option::{None, Some};
 
 /// A mutable memory location that admits only `Copy` data.
 #[unstable = "likely to be renamed; otherwise stable"]
diff --git a/src/libcore/char.rs b/src/libcore/char.rs
index a729596e9d2..2bebe87a14c 100644
--- a/src/libcore/char.rs
+++ b/src/libcore/char.rs
@@ -16,7 +16,8 @@
 #![doc(primitive = "char")]
 
 use mem::transmute;
-use option::{None, Option, Some};
+use option::Option;
+use option::Option::{None, Some};
 use iter::{range_step, Iterator, RangeStep};
 use slice::SlicePrelude;
 
diff --git a/src/libcore/cmp.rs b/src/libcore/cmp.rs
index df19256471e..a5ba2b03b15 100644
--- a/src/libcore/cmp.rs
+++ b/src/libcore/cmp.rs
@@ -44,7 +44,8 @@
 pub use self::Ordering::*;
 
 use kinds::Sized;
-use option::{Option, Some, None};
+use option::Option;
+use option::Option::{Some, None};
 
 /// Trait for values that can be compared for equality and inequality.
 ///
@@ -288,10 +289,11 @@ pub fn partial_max<T: PartialOrd>(v1: T, v2: T) -> Option<T> {
 
 // Implementation of PartialEq, Eq, PartialOrd and Ord for primitive types
 mod impls {
-    use cmp::{PartialOrd, Ord, PartialEq, Eq, Ordering,
-              Less, Greater, Equal};
+    use cmp::{PartialOrd, Ord, PartialEq, Eq, Ordering};
+    use cmp::Ordering::{Less, Greater, Equal};
     use kinds::Sized;
-    use option::{Option, Some, None};
+    use option::Option;
+    use option::Option::{Some, None};
 
     macro_rules! partial_eq_impl(
         ($($t:ty)*) => ($(
diff --git a/src/libcore/fmt/float.rs b/src/libcore/fmt/float.rs
index 1e31df83779..400ce76baa0 100644
--- a/src/libcore/fmt/float.rs
+++ b/src/libcore/fmt/float.rs
@@ -20,7 +20,7 @@ use fmt;
 use iter::{range, DoubleEndedIteratorExt};
 use num::{Float, FPNaN, FPInfinite, ToPrimitive};
 use num::cast;
-use result::Ok;
+use result::Result::Ok;
 use slice::{mod, SlicePrelude};
 use str::StrPrelude;
 
diff --git a/src/libcore/fmt/mod.rs b/src/libcore/fmt/mod.rs
index 7b9dd70c58f..9b67cdd3e12 100644
--- a/src/libcore/fmt/mod.rs
+++ b/src/libcore/fmt/mod.rs
@@ -17,9 +17,10 @@ use cell::{Cell, Ref, RefMut};
 use iter::{Iterator, IteratorExt, range};
 use kinds::{Copy, Sized};
 use mem;
-use option::{Option, Some, None};
+use option::Option;
+use option::Option::{Some, None};
 use ops::Deref;
-use result::{Ok, Err};
+use result::Result::{Ok, Err};
 use result;
 use slice::SlicePrelude;
 use slice;
diff --git a/src/libcore/iter.rs b/src/libcore/iter.rs
index f137f43058f..49865bd3c7d 100644
--- a/src/libcore/iter.rs
+++ b/src/libcore/iter.rs
@@ -62,7 +62,8 @@ use cmp::Ord;
 use mem;
 use num::{ToPrimitive, Int};
 use ops::{Add, Deref};
-use option::{Option, Some, None};
+use option::Option;
+use option::Option::{Some, None};
 use uint;
 
 #[deprecated = "renamed to Extend"] pub use self::Extend as Extendable;
@@ -2458,7 +2459,9 @@ pub fn repeat<T: Clone>(elt: T) -> Repeat<T> {
 pub mod order {
     use cmp;
     use cmp::{Eq, Ord, PartialOrd, PartialEq};
-    use option::{Option, Some, None};
+    use cmp::Ordering::{Equal, Less, Greater};
+    use option::Option;
+    use option::Option::{Some, None};
     use super::Iterator;
 
     /// Compare `a` and `b` for equality using `Eq`
@@ -2476,11 +2479,11 @@ pub mod order {
     pub fn cmp<A: Ord, T: Iterator<A>, S: Iterator<A>>(mut a: T, mut b: S) -> cmp::Ordering {
         loop {
             match (a.next(), b.next()) {
-                (None, None) => return cmp::Equal,
-                (None, _   ) => return cmp::Less,
-                (_   , None) => return cmp::Greater,
+                (None, None) => return Equal,
+                (None, _   ) => return Less,
+                (_   , None) => return Greater,
                 (Some(x), Some(y)) => match x.cmp(&y) {
-                    cmp::Equal => (),
+                    Equal => (),
                     non_eq => return non_eq,
                 },
             }
@@ -2492,11 +2495,11 @@ pub mod order {
             -> Option<cmp::Ordering> {
         loop {
             match (a.next(), b.next()) {
-                (None, None) => return Some(cmp::Equal),
-                (None, _   ) => return Some(cmp::Less),
-                (_   , None) => return Some(cmp::Greater),
+                (None, None) => return Some(Equal),
+                (None, _   ) => return Some(Less),
+                (_   , None) => return Some(Greater),
                 (Some(x), Some(y)) => match x.partial_cmp(&y) {
-                    Some(cmp::Equal) => (),
+                    Some(Equal) => (),
                     non_eq => return non_eq,
                 },
             }
diff --git a/src/libcore/num/mod.rs b/src/libcore/num/mod.rs
index 748e8942a3f..e6946c83ceb 100644
--- a/src/libcore/num/mod.rs
+++ b/src/libcore/num/mod.rs
@@ -30,7 +30,8 @@ use kinds::Copy;
 use mem::size_of;
 use ops::{Add, Sub, Mul, Div, Rem, Neg};
 use ops::{Not, BitAnd, BitOr, BitXor, Shl, Shr};
-use option::{Option, Some, None};
+use option::Option;
+use option::Option::{Some, None};
 use str::{FromStr, from_str, StrPrelude};
 
 /// Simultaneous division and remainder
diff --git a/src/libcore/option.rs b/src/libcore/option.rs
index ef895a1d7fb..8ba41c3575f 100644
--- a/src/libcore/option.rs
+++ b/src/libcore/option.rs
@@ -149,7 +149,8 @@ use cmp::{Eq, Ord};
 use default::Default;
 use iter::{Iterator, IteratorExt, DoubleEndedIterator, FromIterator, ExactSizeIterator};
 use mem;
-use result::{Result, Ok, Err};
+use result::Result;
+use result::Result::{Ok, Err};
 use slice;
 use slice::AsSlice;
 use clone::Clone;
diff --git a/src/libcore/ptr.rs b/src/libcore/ptr.rs
index 416bc4588b4..3f6ac49786d 100644
--- a/src/libcore/ptr.rs
+++ b/src/libcore/ptr.rs
@@ -90,9 +90,12 @@
 use mem;
 use clone::Clone;
 use intrinsics;
-use option::{Some, None, Option};
+use option::Option;
+use option::Option::{Some, None};
 
-use cmp::{PartialEq, Eq, PartialOrd, Equiv, Ordering, Less, Equal, Greater};
+use cmp::{PartialEq, Eq, PartialOrd, Equiv};
+use cmp::Ordering;
+use cmp::Ordering::{Less, Equal, Greater};
 
 pub use intrinsics::copy_memory;
 pub use intrinsics::copy_nonoverlapping_memory;
diff --git a/src/libcore/result.rs b/src/libcore/result.rs
index 7c88106c9ec..0cf8e6affd7 100644
--- a/src/libcore/result.rs
+++ b/src/libcore/result.rs
@@ -236,7 +236,8 @@ use std::fmt::Show;
 use slice;
 use slice::AsSlice;
 use iter::{Iterator, IteratorExt, DoubleEndedIterator, FromIterator, ExactSizeIterator};
-use option::{None, Option, Some};
+use option::Option;
+use option::Option::{None, Some};
 
 /// `Result` is a type that represents either success (`Ok`) or failure (`Err`).
 ///
diff --git a/src/libcore/slice.rs b/src/libcore/slice.rs
index ce9f551670b..b8df36c91bc 100644
--- a/src/libcore/slice.rs
+++ b/src/libcore/slice.rs
@@ -36,13 +36,15 @@
 
 use mem::transmute;
 use clone::Clone;
-use cmp::{PartialEq, PartialOrd, Eq, Ord, Ordering, Less, Equal, Greater, Equiv};
+use cmp::{Ordering, PartialEq, PartialOrd, Eq, Ord, Equiv};
+use cmp::Ordering::{Less, Equal, Greater};
 use cmp;
 use default::Default;
 use iter::*;
 use num::Int;
 use ops;
-use option::{None, Option, Some};
+use option::Option;
+use option::Option::{None, Some};
 use ptr;
 use ptr::RawPtr;
 use mem;
@@ -1702,7 +1704,8 @@ pub mod raw {
     use mem::transmute;
     use ptr::RawPtr;
     use raw::Slice;
-    use option::{None, Option, Some};
+    use option::Option;
+    use option::Option::{None, Some};
 
     /// Form a slice from a pointer and length (as a number of units,
     /// not bytes).
diff --git a/src/libcore/str.rs b/src/libcore/str.rs
index 4be628f0ac3..1d59567cbe4 100644
--- a/src/libcore/str.rs
+++ b/src/libcore/str.rs
@@ -29,7 +29,8 @@ use iter::range;
 use kinds::Sized;
 use mem;
 use num::Int;
-use option::{Option, None, Some};
+use option::Option;
+use option::Option::{None, Some};
 use ptr::RawPtr;
 use raw::{Repr, Slice};
 use slice::{mod, SlicePrelude};
@@ -1209,9 +1210,11 @@ Section: Trait implementations
 
 #[allow(missing_docs)]
 pub mod traits {
-    use cmp::{Ord, Ordering, Less, Equal, Greater, PartialEq, PartialOrd, Equiv, Eq};
+    use cmp::{Ordering, Ord, PartialEq, PartialOrd, Equiv, Eq};
+    use cmp::Ordering::{Less, Equal, Greater};
     use iter::IteratorExt;
-    use option::{Option, Some};
+    use option::Option;
+    use option::Option::Some;
     use ops;
     use str::{Str, StrPrelude, eq_slice};
 
diff --git a/src/libcore/tuple/mod.rs b/src/libcore/tuple/mod.rs
index 56ea7a4e7a1..5ad01ae6744 100644
--- a/src/libcore/tuple/mod.rs
+++ b/src/libcore/tuple/mod.rs
@@ -69,7 +69,8 @@ pub use unit;
 use clone::Clone;
 use cmp::*;
 use default::Default;
-use option::{Option, Some};
+use option::Option;
+use option::Option::Some;
 
 // macro for implementing n-ary tuple functions and operations
 macro_rules! tuple_impls {