rollup merge of #22024: alexcrichton/ascii

* Move the type parameter on the `AsciiExt` trait to an associated type named
  `Owned`.
* Move `ascii::escape_default` to using an iterator.

This is a breaking change due to the removal of the type parameter on the
`AsciiExt` trait as well as the modifications to the `escape_default` function
to returning an iterator. Manual implementations of `AsciiExt` (or `AsciiExt`
bounds) should be adjusted to remove the type parameter and using the new
`escape_default` should be relatively straightforward.

[breaking-change]

1 files changed, 6 insertions, 1 deletions

diff --git a/src/libstd/sys/common/wtf8.rs b/src/libstd/sys/common/wtf8.rs
index 6047f94b3b4..b610f6c370b 100644
--- a/src/libstd/sys/common/wtf8.rs
+++ b/src/libstd/sys/common/wtf8.rs
@@ -817,7 +817,9 @@ impl<'a, S: Writer + Hasher> Hash<S> for Wtf8 {
     }
 }
 
-impl AsciiExt<Wtf8Buf> for Wtf8 {
+impl AsciiExt for Wtf8 {
+    type Owned = Wtf8Buf;
+
     fn is_ascii(&self) -> bool {
         self.bytes.is_ascii()
     }
@@ -830,6 +832,9 @@ impl AsciiExt<Wtf8Buf> for Wtf8 {
     fn eq_ignore_ascii_case(&self, other: &Wtf8) -> bool {
         self.bytes.eq_ignore_ascii_case(&other.bytes)
     }
+
+    fn make_ascii_uppercase(&mut self) { self.bytes.make_ascii_uppercase() }
+    fn make_ascii_lowercase(&mut self) { self.bytes.make_ascii_lowercase() }
 }
 
 #[cfg(test)]