Create (unstable) 2024 edition

compiler/rustc_ast/src/token.rs

@@ -722,7 +722,7 @@ impl NonterminalKind {
                 Edition::Edition2015 | Edition::Edition2018 => {
                     NonterminalKind::PatParam { inferred: true }
                 }
-                Edition::Edition2021 => NonterminalKind::PatWithOr,
+                Edition::Edition2021 | Edition::Edition2024 => NonterminalKind::PatWithOr,
             },
             sym::pat_param => NonterminalKind::PatParam { inferred: false },
             sym::expr => NonterminalKind::Expr,

compiler/rustc_builtin_macros/src/standard_library_imports.rs

@@ -70,6 +70,7 @@ pub fn inject(
             Edition2015 => sym::rust_2015,
             Edition2018 => sym::rust_2018,
             Edition2021 => sym::rust_2021,
+            Edition2024 => sym::rust_2024,
         }])
         .map(|&symbol| Ident::new(symbol, span))
         .collect();

compiler/rustc_expand/src/mbe/macro_rules.rs

@@ -1033,7 +1033,7 @@ fn check_matcher_core(
                             err.span_label(sp, format!("not allowed after `{}` fragments", kind));
 
                             if kind == NonterminalKind::PatWithOr
-                                && sess.edition == Edition::Edition2021
+                                && sess.edition.rust_2021()
                                 && next_token.is_token(&BinOp(token::BinOpToken::Or))
                             {
                                 let suggestion = quoted_tt_to_string(&TokenTree::MetaVarDecl(

compiler/rustc_session/src/session.rs

@@ -945,6 +945,11 @@ impl Session {
         self.opts.edition >= Edition::Edition2021
     }
 
+    /// Are we allowed to use features from the Rust 2024 edition?
+    pub fn rust_2024(&self) -> bool {
+        self.opts.edition >= Edition::Edition2024
+    }
+
     pub fn edition(&self) -> Edition {
         self.opts.edition
     }

compiler/rustc_span/src/edition.rs

@@ -22,13 +22,15 @@ pub enum Edition {
     Edition2018,
     /// The 2021 edition
     Edition2021,
+    /// The 2024 edition
+    Edition2024,
 }
 
 // Must be in order from oldest to newest.
 pub const ALL_EDITIONS: &[Edition] =
-    &[Edition::Edition2015, Edition::Edition2018, Edition::Edition2021];
+    &[Edition::Edition2015, Edition::Edition2018, Edition::Edition2021, Edition::Edition2024];
 
-pub const EDITION_NAME_LIST: &str = "2015|2018|2021";
+pub const EDITION_NAME_LIST: &str = "2015|2018|2021|2024";
 
 pub const DEFAULT_EDITION: Edition = Edition::Edition2015;
 
@@ -40,6 +42,7 @@ impl fmt::Display for Edition {
             Edition::Edition2015 => "2015",
             Edition::Edition2018 => "2018",
             Edition::Edition2021 => "2021",
+            Edition::Edition2024 => "2024",
         };
         write!(f, "{}", s)
     }
@@ -51,6 +54,7 @@ impl Edition {
             Edition::Edition2015 => "rust_2015_compatibility",
             Edition::Edition2018 => "rust_2018_compatibility",
             Edition::Edition2021 => "rust_2021_compatibility",
+            Edition::Edition2024 => "rust_2024_compatibility",
         }
     }
 
@@ -59,6 +63,7 @@ impl Edition {
             Edition::Edition2015 => sym::rust_2015_preview,
             Edition::Edition2018 => sym::rust_2018_preview,
             Edition::Edition2021 => sym::rust_2021_preview,
+            Edition::Edition2024 => sym::rust_2024_preview,
         }
     }
 
@@ -67,8 +72,28 @@ impl Edition {
             Edition::Edition2015 => true,
             Edition::Edition2018 => true,
             Edition::Edition2021 => true,
+            Edition::Edition2024 => false,
         }
     }
+
+    pub fn rust_2015(&self) -> bool {
+        *self == Edition::Edition2015
+    }
+
+    /// Are we allowed to use features from the Rust 2018 edition?
+    pub fn rust_2018(&self) -> bool {
+        *self >= Edition::Edition2018
+    }
+
+    /// Are we allowed to use features from the Rust 2021 edition?
+    pub fn rust_2021(&self) -> bool {
+        *self >= Edition::Edition2021
+    }
+
+    /// Are we allowed to use features from the Rust 2024 edition?
+    pub fn rust_2024(&self) -> bool {
+        *self >= Edition::Edition2024
+    }
 }
 
 impl FromStr for Edition {
@@ -78,6 +103,7 @@ impl FromStr for Edition {
             "2015" => Ok(Edition::Edition2015),
             "2018" => Ok(Edition::Edition2018),
             "2021" => Ok(Edition::Edition2021),
+            "2024" => Ok(Edition::Edition2024),
             _ => Err(()),
         }
     }

compiler/rustc_span/src/lib.rs

@@ -698,6 +698,11 @@ impl Span {
         self.edition() >= edition::Edition::Edition2021
     }
 
+    #[inline]
+    pub fn rust_2024(self) -> bool {
+        self.edition() >= edition::Edition::Edition2024
+    }
+
     /// Returns the source callee.
     ///
     /// Returns `None` if the supplied span has no expansion trace,

compiler/rustc_span/src/symbol.rs

@@ -1145,6 +1145,8 @@ symbols! {
         rust_2018_preview,
         rust_2021,
         rust_2021_preview,
+        rust_2024,
+        rust_2024_preview,
         rust_begin_unwind,
         rust_eh_catch_typeinfo,
         rust_eh_personality,

library/core/src/prelude/mod.rs

@@ -45,3 +45,13 @@ pub mod rust_2021 {
     #[doc(no_inline)]
     pub use crate::convert::{TryFrom, TryInto};
 }
+
+/// The 2024 edition of the core prelude.
+///
+/// See the [module-level documentation](self) for more.
+#[unstable(feature = "prelude_2024", issue = "none")]
+pub mod rust_2024 {
+    #[unstable(feature = "prelude_2024", issue = "none")]
+    #[doc(no_inline)]
+    pub use super::rust_2021::*;
+}

library/std/src/lib.rs

@@ -279,6 +279,7 @@
 #![feature(panic_info_message)]
 #![feature(panic_internals)]
 #![feature(portable_simd)]
+#![feature(prelude_2024)]
 #![feature(ptr_as_uninit)]
 #![feature(raw_os_nonzero)]
 #![feature(slice_internals)]

library/std/src/prelude/mod.rs

@@ -132,3 +132,17 @@ pub mod rust_2021 {
     #[doc(no_inline)]
     pub use core::prelude::rust_2021::*;
 }
+
+/// The 2024 version of the prelude of The Rust Standard Library.
+///
+/// See the [module-level documentation](self) for more.
+#[unstable(feature = "prelude_2024", issue = "none")]
+pub mod rust_2024 {
+    #[unstable(feature = "prelude_2024", issue = "none")]
+    #[doc(no_inline)]
+    pub use super::v1::*;
+
+    #[unstable(feature = "prelude_2024", issue = "none")]
+    #[doc(no_inline)]
+    pub use core::prelude::rust_2024::*;
+}

src/test/ui/hello.rs

@@ -1,5 +1,12 @@
 // run-pass
+// revisions: e2015 e2018 e2021 e2024
 
-pub fn main() {
-    println!("hello, world");
+//[e2018] edition:2018
+//[e2021] edition:2021
+//[e2024] edition:2024
+
+//[e2024] compile-flags: -Zunstable-options
+
+fn main() {
+    println!("hello");
 }

src/tools/rustfmt/src/bin/main.rs

@@ -693,6 +693,7 @@ fn edition_from_edition_str(edition_str: &str) -> Result<Edition> {
         "2015" => Ok(Edition::Edition2015),
         "2018" => Ok(Edition::Edition2018),
         "2021" => Ok(Edition::Edition2021),
+        "2024" => Ok(Edition::Edition2024),
         _ => Err(format_err!("Invalid value for `--edition`")),
     }
 }

src/tools/rustfmt/src/config/options.rs

@@ -423,6 +423,10 @@ pub enum Edition {
     #[doc_hint = "2021"]
     /// Edition 2021.
     Edition2021,
+    #[value = "2024"]
+    #[doc_hint = "2024"]
+    /// Edition 2024.
+    Edition2024,
 }
 
 impl Default for Edition {
@@ -437,6 +441,7 @@ impl From<Edition> for rustc_span::edition::Edition {
             Edition::Edition2015 => Self::Edition2015,
             Edition::Edition2018 => Self::Edition2018,
             Edition::Edition2021 => Self::Edition2021,
+            Edition::Edition2024 => Self::Edition2024,
         }
     }
 }