Rename rustc_contract to contract

This has now been approved as a language feature and no longer needs
a `rustc_` prefix.

Also change the `contracts` feature to be marked as incomplete and
`contracts_internals` as internal.

Author: celinval

compiler/rustc_ast_passes/src/feature_gate.rs

@@ -548,8 +548,8 @@ pub fn check_crate(krate: &ast::Crate, sess: &Session, features: &Features) {
     gate_all!(pin_ergonomics, "pinned reference syntax is experimental");
     gate_all!(unsafe_fields, "`unsafe` fields are experimental");
     gate_all!(unsafe_binders, "unsafe binder types are experimental");
-    gate_all!(rustc_contracts, "contracts are experimental");
-    gate_all!(rustc_contracts_internals, "contract internal machinery is for internal use only");
+    gate_all!(contracts, "contracts are incomplete");
+    gate_all!(contracts_internals, "contract internal machinery is for internal use only");
 
     if !visitor.features.never_patterns() {
         if let Some(spans) = spans.get(&sym::never_patterns) {

compiler/rustc_builtin_macros/src/contracts.rs

@@ -123,7 +123,7 @@ fn expand_contract_clause(
 
     // Record the span as a contract attribute expansion.
     // This is used later to stop users from using the extended syntax directly
-    // which is gated via `rustc_contracts_internals`.
+    // which is gated via `contracts_internals`.
     ecx.psess().contract_attribute_spans.push(attr_span);
 
     Ok(new_tts)
@@ -137,7 +137,7 @@ fn expand_requires_tts(
 ) -> Result<TokenStream, ErrorGuaranteed> {
     expand_contract_clause(_ecx, attr_span, annotated, |new_tts| {
         new_tts.push_tree(TokenTree::Token(
-            token::Token::from_ast_ident(Ident::new(kw::RustcContractRequires, attr_span)),
+            token::Token::from_ast_ident(Ident::new(kw::ContractRequires, attr_span)),
             Spacing::Joint,
         ));
         new_tts.push_tree(TokenTree::Token(
@@ -162,7 +162,7 @@ fn expand_ensures_tts(
 ) -> Result<TokenStream, ErrorGuaranteed> {
     expand_contract_clause(_ecx, attr_span, annotated, |new_tts| {
         new_tts.push_tree(TokenTree::Token(
-            token::Token::from_ast_ident(Ident::new(kw::RustcContractEnsures, attr_span)),
+            token::Token::from_ast_ident(Ident::new(kw::ContractEnsures, attr_span)),
             Spacing::Joint,
         ));
         new_tts.push_tree(TokenTree::Delimited(

compiler/rustc_feature/src/unstable.rs

@@ -404,7 +404,7 @@ declare_features! (
     /// Allows the use of `#[cfg(<true/false>)]`.
     (unstable, cfg_boolean_literals, "1.83.0", Some(131204)),
     /// Allows the use of `#[cfg(contract_checks)` to check if contract checks are enabled.
-    (unstable, cfg_contract_checks, "CURRENT_RUSTC_VERSION", Some(133866)),
+    (unstable, cfg_contract_checks, "CURRENT_RUSTC_VERSION", Some(128044)),
     /// Allows the use of `#[cfg(overflow_checks)` to check if integer overflow behaviour.
     (unstable, cfg_overflow_checks, "1.71.0", Some(111466)),
     /// Provides the relocation model information as cfg entry
@@ -447,6 +447,10 @@ declare_features! (
     (unstable, const_trait_impl, "1.42.0", Some(67792)),
     /// Allows the `?` operator in const contexts.
     (unstable, const_try, "1.56.0", Some(74935)),
+    /// Allows use of contracts attributes.
+    (incomplete, contracts, "CURRENT_RUSTC_VERSION", Some(128044)),
+    /// Allows access to internal machinery used to implement contracts.
+    (internal, contracts_internals, "CURRENT_RUSTC_VERSION", Some(128044)),
     /// Allows coroutines to be cloned.
     (unstable, coroutine_clone, "1.65.0", Some(95360)),
     /// Allows defining coroutines.
@@ -608,10 +612,6 @@ declare_features! (
     (unstable, return_type_notation, "1.70.0", Some(109417)),
     /// Allows `extern "rust-cold"`.
     (unstable, rust_cold_cc, "1.63.0", Some(97544)),
-    /// Allows use of contracts attributes.
-    (unstable, rustc_contracts, "CURRENT_RUSTC_VERSION", Some(133866)),
-    /// Allows access to internal machinery used to implement contracts.
-    (unstable, rustc_contracts_internals, "CURRENT_RUSTC_VERSION", Some(133866)),
     /// Allows use of x86 SHA512, SM3 and SM4 target-features and intrinsics
     (unstable, sha512_sm_x86, "1.82.0", Some(126624)),
     /// Allows the use of SIMD types in functions declared in `extern` blocks.

compiler/rustc_parse/src/parser/generics.rs

@@ -297,29 +297,29 @@ impl<'a> Parser<'a> {
         })
     }
 
-    /// Parses a rustc-internal fn contract
-    /// (`rustc_contract_requires(WWW) rustc_contract_ensures(ZZZ)`)
+    /// Parses an experimental fn contract
+    /// (`contract_requires(WWW) contract_ensures(ZZZ)`)
     pub(super) fn parse_contract(
         &mut self,
     ) -> PResult<'a, Option<rustc_ast::ptr::P<ast::FnContract>>> {
         let gate = |span| {
             if self.psess.contract_attribute_spans.contains(span) {
                 // span was generated via a builtin contracts attribute, so gate as end-user visible
-                self.psess.gated_spans.gate(sym::rustc_contracts, span);
+                self.psess.gated_spans.gate(sym::contracts, span);
             } else {
                 // span was not generated via a builtin contracts attribute, so gate as internal machinery
-                self.psess.gated_spans.gate(sym::rustc_contracts_internals, span);
+                self.psess.gated_spans.gate(sym::contracts_internals, span);
             }
         };
 
-        let requires = if self.eat_keyword_noexpect(exp!(RustcContractRequires).kw) {
+        let requires = if self.eat_keyword_noexpect(exp!(ContractRequires).kw) {
             let precond = self.parse_expr()?;
             gate(precond.span);
             Some(precond)
         } else {
             None
         };
-        let ensures = if self.eat_keyword_noexpect(exp!(RustcContractEnsures).kw) {
+        let ensures = if self.eat_keyword_noexpect(exp!(ContractEnsures).kw) {
             let postcond = self.parse_expr()?;
             gate(postcond.span);
             Some(postcond)

compiler/rustc_parse/src/parser/token_type.rs

@@ -83,6 +83,8 @@ pub enum TokenType {
     KwCatch,
     KwConst,
     KwContinue,
+    KwContractEnsures,
+    KwContractRequires,
     KwCrate,
     KwDefault,
     KwDyn,
@@ -108,8 +110,6 @@ pub enum TokenType {
     KwRef,
     KwReturn,
     KwReuse,
-    KwRustcContractEnsures,
-    KwRustcContractRequires,
     KwSafe,
     KwSelfUpper,
     KwStatic,
@@ -219,6 +219,8 @@ impl TokenType {
             KwCatch,
             KwConst,
             KwContinue,
+            KwContractEnsures,
+            KwContractRequires,
             KwCrate,
             KwDefault,
             KwDyn,
@@ -244,8 +246,6 @@ impl TokenType {
             KwRef,
             KwReturn,
             KwReuse,
-            KwRustcContractEnsures,
-            KwRustcContractRequires,
             KwSafe,
             KwSelfUpper,
             KwStatic,
@@ -293,6 +293,8 @@ impl TokenType {
             TokenType::KwCatch => Some(kw::Catch),
             TokenType::KwConst => Some(kw::Const),
             TokenType::KwContinue => Some(kw::Continue),
+            TokenType::KwContractEnsures => Some(kw::ContractEnsures),
+            TokenType::KwContractRequires => Some(kw::ContractRequires),
             TokenType::KwCrate => Some(kw::Crate),
             TokenType::KwDefault => Some(kw::Default),
             TokenType::KwDyn => Some(kw::Dyn),
@@ -318,8 +320,6 @@ impl TokenType {
             TokenType::KwRef => Some(kw::Ref),
             TokenType::KwReturn => Some(kw::Return),
             TokenType::KwReuse => Some(kw::Reuse),
-            TokenType::KwRustcContractEnsures => Some(kw::RustcContractEnsures),
-            TokenType::KwRustcContractRequires => Some(kw::RustcContractRequires),
             TokenType::KwSafe => Some(kw::Safe),
             TokenType::KwSelfUpper => Some(kw::SelfUpper),
             TokenType::KwStatic => Some(kw::Static),
@@ -525,6 +525,8 @@ macro_rules! exp {
     (Catch)          => { exp!(@kw, Catch,      KwCatch) };
     (Const)          => { exp!(@kw, Const,      KwConst) };
     (Continue)       => { exp!(@kw, Continue,   KwContinue) };
+    (ContractEnsures)  => { exp!(@kw, ContractEnsures, KwContractEnsures) };
+    (ContractRequires) => { exp!(@kw, ContractRequires, KwContractRequires) };
     (Crate)          => { exp!(@kw, Crate,      KwCrate) };
     (Default)        => { exp!(@kw, Default,    KwDefault) };
     (Dyn)            => { exp!(@kw, Dyn,        KwDyn) };
@@ -550,8 +552,6 @@ macro_rules! exp {
     (Ref)            => { exp!(@kw, Ref,        KwRef) };
     (Return)         => { exp!(@kw, Return,     KwReturn) };
     (Reuse)          => { exp!(@kw, Reuse,      KwReuse) };
-    (RustcContractEnsures)  => { exp!(@kw, RustcContractEnsures, KwRustcContractEnsures) };
-    (RustcContractRequires) => { exp!(@kw, RustcContractRequires, KwRustcContractRequires) };
     (Safe)           => { exp!(@kw, Safe,       KwSafe) };
     (SelfUpper)      => { exp!(@kw, SelfUpper,  KwSelfUpper) };
     (Static)         => { exp!(@kw, Static,     KwStatic) };

compiler/rustc_span/src/symbol.rs

@@ -118,8 +118,8 @@ symbols! {
         MacroRules:         "macro_rules",
         Raw:                "raw",
         Reuse:              "reuse",
-        RustcContractEnsures:  "rustc_contract_ensures",
-        RustcContractRequires: "rustc_contract_requires",
+        ContractEnsures:  "contract_ensures",
+        ContractRequires: "contract_requires",
         Safe:               "safe",
         Union:              "union",
         Yeet:               "yeet",
@@ -682,7 +682,9 @@ symbols! {
         contract_check_ensures,
         contract_check_requires,
         contract_checks,
+        contracts,
         contracts_ensures,
+        contracts_internals,
         contracts_requires,
         convert_identity,
         copy,
@@ -1716,8 +1718,6 @@ symbols! {
         rustc_const_stable,
         rustc_const_stable_indirect,
         rustc_const_unstable,
-        rustc_contracts,
-        rustc_contracts_internals,
         rustc_conversion_suggestion,
         rustc_deallocator,
         rustc_def_path,

library/core/src/contracts.rs

@@ -6,7 +6,7 @@ pub use crate::macros::builtin::{contracts_ensures as ensures, contracts_require
 /// Emitted by rustc as a desugaring of `#[ensures(PRED)] fn foo() -> R { ... [return R;] ... }`
 /// into: `fn foo() { let _check = build_check_ensures(|ret| PRED) ... [return _check(R);] ... }`
 /// (including the implicit return of the tail expression, if any).
-#[unstable(feature = "rustc_contracts_internals", issue = "133866" /* compiler-team#759 */)]
+#[unstable(feature = "contracts_internals", issue = "128044" /* compiler-team#759 */)]
 #[lang = "contract_build_check_ensures"]
 #[track_caller]
 pub fn build_check_ensures<Ret, C>(cond: C) -> impl (Fn(Ret) -> Ret) + Copy

library/core/src/intrinsics/mod.rs

@@ -4051,8 +4051,8 @@ pub const unsafe fn const_deallocate(_ptr: *mut u8, _size: usize, _align: usize)
 /// checking is turned on, so that we can specify contracts in libstd
 /// and let an end user opt into turning them on.
 #[cfg(not(bootstrap))]
-#[rustc_const_unstable(feature = "rustc_contracts_internals", issue = "133866" /* compiler-team#759 */)]
-#[unstable(feature = "rustc_contracts_internals", issue = "133866" /* compiler-team#759 */)]
+#[rustc_const_unstable(feature = "contracts_internals", issue = "128044" /* compiler-team#759 */)]
+#[unstable(feature = "contracts_internals", issue = "128044" /* compiler-team#759 */)]
 #[inline(always)]
 #[rustc_intrinsic]
 pub const fn contract_checks() -> bool {
@@ -4067,7 +4067,7 @@ pub const fn contract_checks() -> bool {
 /// By default, if `contract_checks` is enabled, this will panic with no unwind if the condition
 /// returns false.
 #[cfg(not(bootstrap))]
-#[unstable(feature = "rustc_contracts_internals", issue = "133866" /* compiler-team#759 */)]
+#[unstable(feature = "contracts_internals", issue = "128044" /* compiler-team#759 */)]
 #[lang = "contract_check_requires"]
 #[rustc_intrinsic]
 pub fn contract_check_requires<C: Fn() -> bool>(cond: C) {
@@ -4082,7 +4082,7 @@ pub fn contract_check_requires<C: Fn() -> bool>(cond: C) {
 /// By default, if `contract_checks` is enabled, this will panic with no unwind if the condition
 /// returns false.
 #[cfg(not(bootstrap))]
-#[unstable(feature = "rustc_contracts_internals", issue = "133866" /* compiler-team#759 */)]
+#[unstable(feature = "contracts_internals", issue = "128044" /* compiler-team#759 */)]
 #[rustc_intrinsic]
 pub fn contract_check_ensures<'a, Ret, C: Fn(&'a Ret) -> bool>(ret: &'a Ret, cond: C) {
     if contract_checks() && !cond(ret) {

library/core/src/lib.rs

@@ -248,7 +248,7 @@ pub mod autodiff {
 }
 
 #[cfg(not(bootstrap))]
-#[unstable(feature = "rustc_contracts", issue = "133866")]
+#[unstable(feature = "contracts", issue = "128044")]
 pub mod contracts;
 
 #[unstable(feature = "cfg_match", issue = "115585")]

library/core/src/macros/mod.rs

@@ -1783,8 +1783,8 @@ pub(crate) mod builtin {
     /// eventually parsed as a unary closure expression that is
     /// invoked on a reference to the return value.
     #[cfg(not(bootstrap))]
-    #[unstable(feature = "rustc_contracts", issue = "133866")]
-    #[allow_internal_unstable(rustc_contracts_internals)]
+    #[unstable(feature = "contracts", issue = "128044")]
+    #[allow_internal_unstable(contracts_internals)]
     #[rustc_builtin_macro]
     pub macro contracts_ensures($item:item) {
         /* compiler built-in */
@@ -1796,8 +1796,8 @@ pub(crate) mod builtin {
     /// eventually parsed as an boolean expression with access to the
     /// function's formal parameters
     #[cfg(not(bootstrap))]
-    #[unstable(feature = "rustc_contracts", issue = "133866")]
-    #[allow_internal_unstable(rustc_contracts_internals)]
+    #[unstable(feature = "contracts", issue = "128044")]
+    #[allow_internal_unstable(contracts_internals)]
     #[rustc_builtin_macro]
     pub macro contracts_requires($item:item) {
         /* compiler built-in */

tests/ui/contracts/contract-annotation-limitations.rs

@@ -1,7 +1,8 @@
 //! Test for some of the existing limitations and the current error messages.
 //! Some of these limitations may be removed in the future.
 
-#![feature(rustc_contracts)]
+#![feature(contracts)]
+//~^ WARN the feature `contracts` is incomplete and may not be safe to use and/or cause compiler crashes [incomplete_features]
 #![allow(dead_code)]
 
 /// Represent a 5-star system.

tests/ui/contracts/contract-annotation-limitations.stderr

@@ -1,14 +1,23 @@
 error: contract annotations is only supported in functions with bodies
-  --> $DIR/contract-annotation-limitations.rs:17:5
+  --> $DIR/contract-annotation-limitations.rs:18:5
    |
 LL |     #[core::contracts::ensures(|ret| ret.is_none_or(Stars::is_valid))]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: contract annotations is only supported in functions with bodies
-  --> $DIR/contract-annotation-limitations.rs:21:5
+  --> $DIR/contract-annotation-limitations.rs:22:5
    |
 LL |     #[core::contracts::ensures(|ret| ret.is_none_or(Stars::is_valid))]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 2 previous errors
+warning: the feature `contracts` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/contract-annotation-limitations.rs:4:12
+   |
+LL | #![feature(contracts)]
+   |            ^^^^^^^^^
+   |
+   = note: see issue #128044 <https://github.com/rust-lang/rust/issues/128044> for more information
+   = note: `#[warn(incomplete_features)]` on by default
+
+error: aborting due to 2 previous errors; 1 warning emitted
 

tests/ui/contracts/contract-attributes-generics.chk_const_fail.stderr

@@ -0,0 +1,11 @@
+warning: the feature `contracts` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/contract-attributes-generics.rs:19:12
+   |
+LL | #![feature(contracts)]
+   |            ^^^^^^^^^
+   |
+   = note: see issue #128044 <https://github.com/rust-lang/rust/issues/128044> for more information
+   = note: `#[warn(incomplete_features)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/contracts/contract-attributes-generics.chk_fail_post.stderr

@@ -0,0 +1,11 @@
+warning: the feature `contracts` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/contract-attributes-generics.rs:19:12
+   |
+LL | #![feature(contracts)]
+   |            ^^^^^^^^^
+   |
+   = note: see issue #128044 <https://github.com/rust-lang/rust/issues/128044> for more information
+   = note: `#[warn(incomplete_features)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/contracts/contract-attributes-generics.chk_fail_pre.stderr

@@ -0,0 +1,11 @@
+warning: the feature `contracts` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/contract-attributes-generics.rs:19:12
+   |
+LL | #![feature(contracts)]
+   |            ^^^^^^^^^
+   |
+   = note: see issue #128044 <https://github.com/rust-lang/rust/issues/128044> for more information
+   = note: `#[warn(incomplete_features)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/contracts/contract-attributes-generics.chk_pass.stderr

@@ -0,0 +1,11 @@
+warning: the feature `contracts` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/contract-attributes-generics.rs:19:12
+   |
+LL | #![feature(contracts)]
+   |            ^^^^^^^^^
+   |
+   = note: see issue #128044 <https://github.com/rust-lang/rust/issues/128044> for more information
+   = note: `#[warn(incomplete_features)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/contracts/contract-attributes-generics.rs

@@ -16,7 +16,8 @@
 //@ [chk_fail_post] compile-flags: -Zcontract-checks=yes
 //@ [chk_const_fail] compile-flags: -Zcontract-checks=yes
 
-#![feature(rustc_contracts)]
+#![feature(contracts)]
+//~^ WARN the feature `contracts` is incomplete and may not be safe to use and/or cause compiler crashes [incomplete_features]
 
 use std::ops::Sub;
 

tests/ui/contracts/contract-attributes-generics.unchk_pass.stderr

@@ -0,0 +1,11 @@
+warning: the feature `contracts` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/contract-attributes-generics.rs:19:12
+   |
+LL | #![feature(contracts)]
+   |            ^^^^^^^^^
+   |
+   = note: see issue #128044 <https://github.com/rust-lang/rust/issues/128044> for more information
+   = note: `#[warn(incomplete_features)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/contracts/contract-attributes-nest.chk_fail_post.stderr

@@ -0,0 +1,11 @@
+warning: the feature `contracts` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/contract-attributes-nest.rs:19:12
+   |
+LL | #![feature(contracts)]
+   |            ^^^^^^^^^
+   |
+   = note: see issue #128044 <https://github.com/rust-lang/rust/issues/128044> for more information
+   = note: `#[warn(incomplete_features)]` on by default
+
+warning: 1 warning emitted
+