Remove unused AsciiExt imports and fix tests related to ascii methods

Many AsciiExt imports have become useless thanks to the inherent ascii
methods added in the last commits. These were removed. In some places, I
fully specified the ascii method being called to enforce usage of the
AsciiExt trait. Note that some imports are not removed but tagged with
a `#[cfg(stage0)]` attribute. This is necessary, because certain ascii
methods are not yet available in stage0. All those imports will be
removed later.

Additionally, failing tests were fixed. The test suite should exit
successfully now.

7 files changed, 0 insertions, 16 deletions

diff --git a/src/liballoc/benches/str.rs b/src/liballoc/benches/str.rs
index fc4063fae92..38c94d4d8b5 100644
--- a/src/liballoc/benches/str.rs
+++ b/src/liballoc/benches/str.rs
@@ -272,15 +272,12 @@ make_test!(match_indices_a_str, s, s.match_indices("a").count());
 make_test!(split_a_str, s, s.split("a").count());
 
 make_test!(trim_ascii_char, s, {
-    use std::ascii::AsciiExt;
     s.trim_matches(|c: char| c.is_ascii())
 });
 make_test!(trim_left_ascii_char, s, {
-    use std::ascii::AsciiExt;
     s.trim_left_matches(|c: char| c.is_ascii())
 });
 make_test!(trim_right_ascii_char, s, {
-    use std::ascii::AsciiExt;
     s.trim_right_matches(|c: char| c.is_ascii())
 });
 
diff --git a/src/liballoc/borrow.rs b/src/liballoc/borrow.rs
index a662e4b1f4f..e8aff099871 100644
--- a/src/liballoc/borrow.rs
+++ b/src/liballoc/borrow.rs
@@ -191,7 +191,6 @@ impl<'a, B: ?Sized> Cow<'a, B>
     /// # Examples
     ///
     /// ```
-    /// use std::ascii::AsciiExt;
     /// use std::borrow::Cow;
     ///
     /// let mut cow = Cow::Borrowed("foo");
diff --git a/src/liballoc/str.rs b/src/liballoc/str.rs
index 2c257b8c736..b75ecb6ea51 100644
--- a/src/liballoc/str.rs
+++ b/src/liballoc/str.rs
@@ -390,8 +390,6 @@ impl str {
     /// # Examples
     ///
     /// ```
-    /// use std::ascii::AsciiExt;
-    ///
     /// let mut v = String::from("hello");
     /// // correct length
     /// assert!(v.get_mut(0..5).is_some());
@@ -617,8 +615,6 @@ impl str {
     /// Basic usage:
     ///
     /// ```
-    /// use std::ascii::AsciiExt;
-    ///
     /// let mut s = "Per Martin-Löf".to_string();
     /// {
     ///     let (first, last) = s.split_at_mut(3);
diff --git a/src/liballoc/string.rs b/src/liballoc/string.rs
index 6d0bb264df1..25fcc1ccdab 100644
--- a/src/liballoc/string.rs
+++ b/src/liballoc/string.rs
@@ -773,8 +773,6 @@ impl String {
     /// Basic usage:
     ///
     /// ```
-    /// use std::ascii::AsciiExt;
-    ///
     /// let mut s = String::from("foobar");
     /// let s_mut_str = s.as_mut_str();
     ///
diff --git a/src/liballoc/tests/str.rs b/src/liballoc/tests/str.rs
index b3178064505..6b075e7ac0e 100644
--- a/src/liballoc/tests/str.rs
+++ b/src/liballoc/tests/str.rs
@@ -706,7 +706,6 @@ fn test_split_at() {
 
 #[test]
 fn test_split_at_mut() {
-    use std::ascii::AsciiExt;
     let mut s = "Hello World".to_string();
     {
         let (a, b) = s.split_at_mut(5);
diff --git a/src/liballoc/tests/vec.rs b/src/liballoc/tests/vec.rs
index 0e25da5bd30..9cfde5dcc73 100644
--- a/src/liballoc/tests/vec.rs
+++ b/src/liballoc/tests/vec.rs
@@ -8,7 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::ascii::AsciiExt;
 use std::borrow::Cow;
 use std::mem::size_of;
 use std::panic;
@@ -966,5 +965,3 @@ fn drain_filter_complex() {
         assert_eq!(vec, vec![1, 3, 5, 7, 9, 11, 13, 15, 17, 19]);
     }
 }
-
-
diff --git a/src/liballoc/vec.rs b/src/liballoc/vec.rs
index cf34e195dea..5aca199cf40 100644
--- a/src/liballoc/vec.rs
+++ b/src/liballoc/vec.rs
@@ -853,8 +853,6 @@ impl<T> Vec<T> {
     /// # Examples
     ///
     /// ```
-    /// use std::ascii::AsciiExt;
-    ///
     /// let mut vec = vec!["foo", "bar", "Bar", "baz", "bar"];
     ///
     /// vec.dedup_by(|a, b| a.eq_ignore_ascii_case(b));