Update compiler/rustc_span/src/edition.rs

Co-authored-by: León Orell Valerian Liehr <[email protected]>

Author: xizheyin

compiler/rustc_span/src/edition.rs

@@ -45,7 +45,7 @@ pub const ALL_EDITIONS: &[Edition] = &[
     Edition::EditionFuture,
 ];
 
-pub const EDITION_NAME_LIST: &str = "<2015|2018|2021|2024>";
+pub const EDITION_NAME_LIST: &str = "<2015|2018|2021|2024|future>";
 
 pub const DEFAULT_EDITION: Edition = Edition::Edition2015;