Fix stability attributes of byte-to-string specialization

LingMan · web-flow · commit eb9f168e1e8a · 2021-05-03T13:00:34.000+02:00
diff --git a/library/alloc/src/string.rs b/library/alloc/src/string.rs
@@ -2288,7 +2288,7 @@ impl ToString for char {
     }
 }
 
-#[stable(feature = "u8_to_string_specialization", since = "1.999.0")]
+#[stable(feature = "u8_to_string_specialization", since = "1.54.0")]
 impl ToString for u8 {
     #[inline]
     fn to_string(&self) -> String {
@@ -2307,7 +2307,7 @@ impl ToString for u8 {
     }
 }
 
-#[stable(feature = "i8_to_string_specialization", since = "1.999.0")]
+#[stable(feature = "i8_to_string_specialization", since = "1.54.0")]
 impl ToString for i8 {
     #[inline]
     fn to_string(&self) -> String {

Original file line number	Diff line number	Diff line change
`@@ -2288,7 +2288,7 @@ impl ToString for char {`
`2288`	`2288`	`}`
`2289`	`2289`	`}`
`2290`	`2290`
`2291`		`-#[stable(feature = "u8_to_string_specialization", since = "1.999.0")]`
	`2291`	`+#[stable(feature = "u8_to_string_specialization", since = "1.54.0")]`
`2292`	`2292`	`impl ToString for u8 {`
`2293`	`2293`	`#[inline]`
`2294`	`2294`	`fn to_string(&self) -> String {`
`@@ -2307,7 +2307,7 @@ impl ToString for u8 {`
`2307`	`2307`	`}`
`2308`	`2308`	`}`
`2309`	`2309`
`2310`		`-#[stable(feature = "i8_to_string_specialization", since = "1.999.0")]`
	`2310`	`+#[stable(feature = "i8_to_string_specialization", since = "1.54.0")]`
`2311`	`2311`	`impl ToString for i8 {`
`2312`	`2312`	`#[inline]`
`2313`	`2313`	`fn to_string(&self) -> String {`