std: Stabilize char_escape_debug

Stabilizes:

* `<char>::escape_debug`
* `std::char::EscapeDebug`

Closes rust-lang#35068

Author: alexcrichton

Diff for: src/liballoc/lib.rs

@@ -79,7 +79,6 @@
 
 #![cfg_attr(test, allow(deprecated))] // rand
 #![cfg_attr(test, feature(placement_in))]
-#![cfg_attr(not(test), feature(char_escape_debug))]
 #![cfg_attr(not(test), feature(core_float))]
 #![cfg_attr(not(test), feature(exact_size_is_empty))]
 #![cfg_attr(not(test), feature(slice_rotate))]

Diff for: src/libcore/char.rs

@@ -379,7 +379,7 @@ pub trait CharExt {
     fn escape_unicode(self) -> EscapeUnicode;
     #[stable(feature = "core", since = "1.6.0")]
     fn escape_default(self) -> EscapeDefault;
-    #[unstable(feature = "char_escape_debug", issue = "35068")]
+    #[stable(feature = "char_escape_debug", since = "1.20.0")]
     fn escape_debug(self) -> EscapeDebug;
     #[stable(feature = "core", since = "1.6.0")]
     fn len_utf8(self) -> usize;
@@ -776,24 +776,24 @@ impl fmt::Display for EscapeDefault {
 ///
 /// [`escape_debug`]: ../../std/primitive.char.html#method.escape_debug
 /// [`char`]: ../../std/primitive.char.html
-#[unstable(feature = "char_escape_debug", issue = "35068")]
+#[stable(feature = "char_escape_debug", since = "1.20.0")]
 #[derive(Clone, Debug)]
 pub struct EscapeDebug(EscapeDefault);
 
-#[unstable(feature = "char_escape_debug", issue = "35068")]
+#[stable(feature = "char_escape_debug", since = "1.20.0")]
 impl Iterator for EscapeDebug {
     type Item = char;
     fn next(&mut self) -> Option<char> { self.0.next() }
     fn size_hint(&self) -> (usize, Option<usize>) { self.0.size_hint() }
 }
 
-#[unstable(feature = "char_escape_debug", issue = "35068")]
+#[stable(feature = "char_escape_debug", since = "1.20.0")]
 impl ExactSizeIterator for EscapeDebug { }
 
 #[unstable(feature = "fused", issue = "35602")]
 impl FusedIterator for EscapeDebug {}
 
-#[unstable(feature = "char_escape_debug", issue = "35068")]
+#[stable(feature = "char_escape_debug", since = "1.20.0")]
 impl fmt::Display for EscapeDebug {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         fmt::Display::fmt(&self.0, f)

Diff for: src/libcore/tests/lib.rs

@@ -11,7 +11,6 @@
 #![deny(warnings)]
 
 #![feature(box_syntax)]
-#![feature(char_escape_debug)]
 #![feature(const_fn)]
 #![feature(core_float)]
 #![feature(core_private_bignum)]

Diff for: src/libstd/lib.rs

@@ -249,7 +249,6 @@
 #![feature(cfg_target_has_atomic)]
 #![feature(cfg_target_thread_local)]
 #![feature(cfg_target_vendor)]
-#![feature(char_escape_debug)]
 #![feature(char_error_internals)]
 #![feature(char_internals)]
 #![feature(collections_range)]

Diff for: src/libstd_unicode/char.rs

@@ -326,7 +326,6 @@ impl char {
     /// As an iterator:
     ///
     /// ```
-    /// # #![feature(char_escape_debug)]
     /// for c in '\n'.escape_debug() {
     ///     print!("{}", c);
     /// }
@@ -336,7 +335,6 @@ impl char {
     /// Using `println!` directly:
     ///
     /// ```
-    /// # #![feature(char_escape_debug)]
     /// println!("{}", '\n'.escape_debug());
     /// ```
     ///
@@ -349,10 +347,9 @@ impl char {
     /// Using `to_string`:
     ///
     /// ```
-    /// # #![feature(char_escape_debug)]
     /// assert_eq!('\n'.escape_debug().to_string(), "\\n");
     /// ```
-    #[unstable(feature = "char_escape_debug", issue = "35068")]
+    #[stable(feature = "char_escape_debug", since = "1.20.0")]
     #[inline]
     pub fn escape_debug(self) -> EscapeDebug {
         C::escape_debug(self)

Diff for: src/libstd_unicode/lib.rs

@@ -32,7 +32,6 @@
 #![deny(warnings)]
 #![no_std]
 
-#![feature(char_escape_debug)]
 #![feature(core_char_ext)]
 #![feature(str_internals)]
 #![feature(core_intrinsics)]