1 files changed, 21 insertions, 0 deletions
diff --git a/src/libstd/sys/common/wtf8.rs b/src/libstd/sys/common/wtf8.rs
index 89200471465..6047f94b3b4 100644
--- a/src/libstd/sys/common/wtf8.rs
+++ b/src/libstd/sys/common/wtf8.rs
@@ -27,6 +27,7 @@ use core::char::{encode_utf8_raw, encode_utf16_raw};
 use core::str::{char_range_at_raw, next_code_point};
 use core::raw::Slice as RawSlice;
 
+use ascii::*;
 use borrow::Cow;
 use cmp;
 use fmt;
@@ -38,6 +39,7 @@ use ops;
 use slice;
 use str;
 use string::{String, CowString};
+use sys_common::AsInner;
 use unicode::str::{Utf16Item, utf16_items};
 use vec::Vec;
 
@@ -384,6 +386,10 @@ pub struct Wtf8 {
     bytes: [u8]
 }
 
+impl AsInner<[u8]> for Wtf8 {
+    fn as_inner(&self) -> &[u8] { &self.bytes }
+}
+
 // FIXME: https://github.com/rust-lang/rust/issues/18805
 impl PartialEq for Wtf8 {
     fn eq(&self, other: &Wtf8) -> bool { self.bytes.eq(&other.bytes) }
@@ -811,6 +817,21 @@ impl<'a, S: Writer + Hasher> Hash<S> for Wtf8 {
     }
 }
 
+impl AsciiExt<Wtf8Buf> for Wtf8 {
+    fn is_ascii(&self) -> bool {
+        self.bytes.is_ascii()
+    }
+    fn to_ascii_uppercase(&self) -> Wtf8Buf {
+        Wtf8Buf { bytes: self.bytes.to_ascii_uppercase() }
+    }
+    fn to_ascii_lowercase(&self) -> Wtf8Buf {
+        Wtf8Buf { bytes: self.bytes.to_ascii_lowercase() }
+    }
+    fn eq_ignore_ascii_case(&self, other: &Wtf8) -> bool {
+        self.bytes.eq_ignore_ascii_case(&other.bytes)
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use prelude::v1::*;