address review

Author: Emilgardis

compiler/rustc_feature/src/active.rs

@@ -530,8 +530,6 @@ declare_features! (
     (active, plugin, "1.0.0", Some(29597), None),
     /// Allows exhaustive integer pattern matching on `usize` and `isize`.
     (active, precise_pointer_size_matching, "1.32.0", Some(56354), None),
-    /// Allows creating a `b'b'` `Literal`
-    (active, proc_macro_byte_character, "CURRENT_RUSTC_VERSION", Some(71358), None),
     /// Allows macro attributes on expressions, statements and non-inline modules.
     (active, proc_macro_hygiene, "1.30.0", Some(54727), None),
     /// Allows `&raw const $place_expr` and `&raw mut $place_expr` expressions.

compiler/rustc_span/src/symbol.rs

@@ -1159,7 +1159,6 @@ symbols! {
         proc_dash_macro: "proc-macro",
         proc_macro,
         proc_macro_attribute,
-        proc_macro_byte_character,
         proc_macro_derive,
         proc_macro_expr,
         proc_macro_gen,

library/proc_macro/src/lib.rs

@@ -1338,7 +1338,7 @@ impl Literal {
     }
 
     /// Byte character literal.
-    #[unstable(feature = "proc_macro_byte_character", issue = "71358")]
+    #[unstable(feature = "proc_macro_byte_character", issue = "115268")]
     pub fn byte_character(byte: u8) -> Literal {
         let string = [byte].escape_ascii().to_string();
         Literal::new(bridge::LitKind::Byte, &string, None)

tests/ui/feature-gates/feature-gate-proc_macro_byte_character.stderr

@@ -4,7 +4,7 @@ error[E0658]: use of unstable library feature 'proc_macro_byte_character'
 LL |     Literal::byte_character(b'a');
    |     ^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = note: see issue #71358 <https://github.com/rust-lang/rust/issues/71358> for more information
+   = note: see issue #115268 <https://github.com/rust-lang/rust/issues/115268> for more information
    = help: add `#![feature(proc_macro_byte_character)]` to the crate attributes to enable
 
 error: aborting due to previous error