Rollup merge of rust-lang#73465 - lzutao:spec-char-tostring, r=sfackler

Manishearth · web-flow · commit d2272d4f6042 · 2020-06-19T09:15:18.000-07:00
Add specialization of `ToString for char` Closes rust-lang#73462
diff --git a/src/liballoc/string.rs b/src/liballoc/string.rs
@@ -2230,6 +2230,14 @@ impl<T: fmt::Display + ?Sized> ToString for T {
     }
 }
 
+#[stable(feature = "char_to_string_specialization", since = "1.46.0")]
+impl ToString for char {
+    #[inline]
+    fn to_string(&self) -> String {
+        String::from(self.encode_utf8(&mut [0; 4]))
+    }
+}
+
 #[stable(feature = "str_to_string_specialization", since = "1.9.0")]
 impl ToString for str {
     #[inline]

Original file line number	Diff line number	Diff line change
`@@ -2230,6 +2230,14 @@ impl<T: fmt::Display + ?Sized> ToString for T {`
`2230`	`2230`	`}`
`2231`	`2231`	`}`
`2232`	`2232`
	`2233`	`+#[stable(feature = "char_to_string_specialization", since = "1.46.0")]`
	`2234`	`+impl ToString for char {`
	`2235`	`+ #[inline]`
	`2236`	`+ fn to_string(&self) -> String {`
	`2237`	`+ String::from(self.encode_utf8(&mut [0; 4]))`
	`2238`	`+ }`
	`2239`	`+}`
	`2240`	`+`
`2233`	`2241`	`#[stable(feature = "str_to_string_specialization", since = "1.9.0")]`
`2234`	`2242`	`impl ToString for str {`
`2235`	`2243`	`#[inline]`