Remove use of now unneeded 'AsciiExt' trait.

lib/build.rs

@@ -8,8 +8,8 @@ use yansi::Color::{Red, Yellow, Blue, White};
 use version_check::{supports_features, is_min_version, is_min_date};
 
 // Specifies the minimum nightly version needed to compile Rocket.
-const MIN_DATE: &'static str = "2017-09-13";
-const MIN_VERSION: &'static str = "1.22.0-nightly";
+const MIN_DATE: &'static str = "2017-11-07";
+const MIN_VERSION: &'static str = "1.23.0-nightly";
 
 fn main() {
     let ok_channel = supports_features();

lib/src/http/raw_str.rs

@@ -2,7 +2,6 @@ use std::ops::{Deref, DerefMut};
 use std::borrow::Cow;
 use std::convert::AsRef;
 use std::cmp::Ordering;
-use std::ascii::AsciiExt;
 use std::str::Utf8Error;
 use std::fmt;
 
@@ -330,30 +329,6 @@ impl ToString for RawStr {
     }
 }
 
-impl AsciiExt for RawStr {
-    type Owned = String;
-
-    #[inline(always)]
-    fn is_ascii(&self) -> bool { (self as &str).is_ascii() }
-
-    #[inline(always)]
-    fn to_ascii_uppercase(&self) -> String { (self as &str).to_ascii_uppercase() }
-
-    #[inline(always)]
-    fn to_ascii_lowercase(&self) -> String { (self as &str).to_ascii_lowercase() }
-
-    #[inline(always)]
-    fn make_ascii_uppercase(&mut self) { (self as &mut str).make_ascii_uppercase() }
-
-    #[inline(always)]
-    fn make_ascii_lowercase(&mut self) { (self as &mut str).make_ascii_lowercase() }
-
-    #[inline(always)]
-    fn eq_ignore_ascii_case(&self, o: &RawStr) -> bool {
-        (self as &str).eq_ignore_ascii_case(o as &str)
-    }
-}
-
 impl Deref for RawStr {
     type Target = str;
 

lib/src/http/uncased.rs

@@ -8,7 +8,6 @@ use std::ops::Deref;
 use std::borrow::{Cow, Borrow};
 use std::cmp::Ordering;
 use std::hash::{Hash, Hasher};
-use std::ascii::AsciiExt;
 use std::fmt;
 
 /// A reference to an uncased (case-preserving) ASCII string. This is typically