Stabilize opaque type precise capturing

Author: compiler-errors

compiler/rustc_ast_passes/src/feature_gate.rs

@@ -557,7 +557,6 @@ pub fn check_crate(krate: &ast::Crate, sess: &Session, features: &Features) {
     gate_all!(fn_delegation, "functions delegation is not yet fully implemented");
     gate_all!(postfix_match, "postfix match is experimental");
     gate_all!(mut_ref, "mutable by-reference bindings are experimental");
-    gate_all!(precise_capturing, "precise captures on `impl Trait` are experimental");
     gate_all!(global_registration, "global registration is experimental");
     gate_all!(unsafe_attributes, "`#[unsafe()]` markers for attributes are experimental");
     gate_all!(return_type_notation, "return type notation is experimental");

compiler/rustc_feature/src/accepted.rs

@@ -309,6 +309,8 @@ declare_features! (
     (accepted, param_attrs, "1.39.0", Some(60406)),
     /// Allows parentheses in patterns.
     (accepted, pattern_parentheses, "1.31.0", Some(51087)),
+    /// Allows `use<'a, 'b, A, B>` in `impl Trait + use<...>` for precise capture of generic args.
+    (accepted, precise_capturing, "CURRENT_RUSTC_VERSION", Some(123432)),
     /// Allows procedural macros in `proc-macro` crates.
     (accepted, proc_macro, "1.29.0", Some(38356)),
     /// Allows multi-segment paths in attributes and derives.

compiler/rustc_feature/src/unstable.rs

@@ -561,8 +561,6 @@ declare_features! (
     (unstable, patchable_function_entry, "1.81.0", Some(123115)),
     /// Allows postfix match `expr.match { ... }`
     (unstable, postfix_match, "1.79.0", Some(121618)),
-    /// Allows `use<'a, 'b, A, B>` in `impl Trait + use<...>` for precise capture of generic args.
-    (unstable, precise_capturing, "1.79.0", Some(123432)),
     /// Allows macro attributes on expressions, statements and non-inline modules.
     (unstable, proc_macro_hygiene, "1.30.0", Some(54727)),
     /// Allows `&raw const $place_expr` and `&raw mut $place_expr` expressions.

compiler/rustc_hir/src/hir.rs

@@ -2773,7 +2773,6 @@ impl PreciseCapturingArg<'_> {
 /// resolution to. Lifetimes don't have this problem, and for them, it's actually
 /// kind of detrimental to use a custom node type versus just using [`Lifetime`],
 /// since resolve_bound_vars operates on `Lifetime`s.
-// FIXME(precise_capturing): Investigate storing this as a path instead?
 #[derive(Debug, Clone, Copy, HashStable_Generic)]
 pub struct PreciseCapturingNonLifetimeArg {
     pub hir_id: HirId,

compiler/rustc_lint/src/impl_trait_overcaptures.rs

@@ -27,8 +27,6 @@ declare_lint! {
     /// ### Example
     ///
     /// ```rust,compile_fail
-    /// # #![feature(precise_capturing)]
-    /// # #![allow(incomplete_features)]
     /// # #![deny(impl_trait_overcaptures)]
     /// # use std::fmt::Display;
     /// let mut x = vec![];
@@ -56,7 +54,6 @@ declare_lint! {
     pub IMPL_TRAIT_OVERCAPTURES,
     Allow,
     "`impl Trait` will capture more lifetimes than possibly intended in edition 2024",
-    @feature_gate = precise_capturing;
     //@future_incompatible = FutureIncompatibleInfo {
     //    reason: FutureIncompatibilityReason::EditionSemanticsChange(Edition::Edition2024),
     //    reference: "<FIXME>",
@@ -75,8 +72,7 @@ declare_lint! {
     /// ### Example
     ///
     /// ```rust,compile_fail
-    /// # #![feature(precise_capturing, lifetime_capture_rules_2024)]
-    /// # #![allow(incomplete_features)]
+    /// # #![feature(lifetime_capture_rules_2024)]
     /// # #![deny(impl_trait_redundant_captures)]
     /// fn test<'a>(x: &'a i32) -> impl Sized + use<'a> { x }
     /// ```
@@ -90,7 +86,6 @@ declare_lint! {
     pub IMPL_TRAIT_REDUNDANT_CAPTURES,
     Warn,
     "redundant precise-capturing `use<...>` syntax on an `impl Trait`",
-    @feature_gate = precise_capturing;
 }
 
 declare_lint_pass!(

compiler/rustc_parse/src/parser/ty.rs

@@ -851,7 +851,6 @@ impl<'a> Parser<'a> {
             // lifetimes and ident params (including SelfUpper). These are validated later
             // for order, duplication, and whether they actually reference params.
             let use_span = self.prev_token.span;
-            self.psess.gated_spans.gate(sym::precise_capturing, use_span);
             let (args, args_span) = self.parse_precise_capturing_args()?;
             GenericBound::Use(args, use_span.to(args_span))
         } else {

tests/rustdoc-json/impl-trait-precise-capturing.rs

@@ -1,5 +1,3 @@
-#![feature(precise_capturing)]
-
 //@ is "$.index[*][?(@.name=='hello')].inner.function.decl.output.impl_trait[1].use[0]" \"\'a\"
 //@ is "$.index[*][?(@.name=='hello')].inner.function.decl.output.impl_trait[1].use[1]" \"T\"
 //@ is "$.index[*][?(@.name=='hello')].inner.function.decl.output.impl_trait[1].use[2]" \"N\"

tests/rustdoc/impl-trait-precise-capturing.rs

@@ -1,7 +1,6 @@
 //@ aux-build:precise-capturing.rs
 
 #![crate_name = "foo"]
-#![feature(precise_capturing)]
 
 extern crate precise_capturing;