Auto merge of #79336 - camelid:rename-feature-oibit-to-auto, r=oli-obk

Rename `optin_builtin_traits` to `auto_traits`

They were originally called "opt-in, built-in traits" (OIBITs), but
people realized that the name was too confusing and a mouthful, and so
they were renamed to just "auto traits". The feature flag's name wasn't
updated, though, so that's what this PR does.

There are some other spots in the compiler that still refer to OIBITs,
but I don't think changing those now is worth it since they are internal
and not particularly relevant to this PR.

Also see <https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/opt-in.2C.20built-in.20traits.20(auto.20traits).20feature.20name>.

r? `@oli-obk` (feel free to re-assign if you're not the right reviewer for this)

compiler/rustc_ast_passes/src/feature_gate.rs

@@ -370,7 +370,7 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
             ast::ItemKind::Trait(ast::IsAuto::Yes, ..) => {
                 gate_feature_post!(
                     &self,
-                    optin_builtin_traits,
+                    auto_traits,
                     i.span,
                     "auto traits are experimental and possibly buggy"
                 );

compiler/rustc_codegen_cranelift/example/mini_core.rs

@@ -1,6 +1,6 @@
 #![feature(
     no_core, lang_items, intrinsics, unboxed_closures, type_ascription, extern_types,
-    untagged_unions, decl_macro, rustc_attrs, transparent_unions, optin_builtin_traits,
+    untagged_unions, decl_macro, rustc_attrs, transparent_unions, auto_traits,
     thread_local,
 )]
 #![no_core]

compiler/rustc_data_structures/src/lib.rs

@@ -15,7 +15,8 @@
 #![feature(fn_traits)]
 #![feature(int_bits_const)]
 #![feature(min_specialization)]
-#![feature(optin_builtin_traits)]
+#![cfg_attr(bootstrap, feature(optin_builtin_traits))]
+#![cfg_attr(not(bootstrap), feature(auto_traits))]
 #![feature(nll)]
 #![feature(allow_internal_unstable)]
 #![feature(hash_raw_entry)]

compiler/rustc_error_codes/src/error_codes/E0198.md

@@ -16,7 +16,7 @@ unsafe.
 This will compile:
 
 ```ignore (ignore auto_trait future compatibility warning)
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 
 struct Foo;
 

compiler/rustc_error_codes/src/error_codes/E0321.md

@@ -4,7 +4,7 @@ or enum type.
 Erroneous code example:
 
 ```compile_fail,E0321
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 
 struct Foo;
 

compiler/rustc_error_codes/src/error_codes/E0567.md

@@ -3,7 +3,7 @@ Generics have been used on an auto trait.
 Erroneous code example:
 
 ```compile_fail,E0567
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 
 auto trait Generic<T> {} // error!
 # fn main() {}
@@ -16,7 +16,7 @@ parameters.
 To fix this issue, just remove the generics:
 
 ```
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 
 auto trait Generic {} // ok!
 # fn main() {}

compiler/rustc_error_codes/src/error_codes/E0568.md

@@ -3,7 +3,7 @@ A super trait has been added to an auto trait.
 Erroneous code example:
 
 ```compile_fail,E0568
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 
 auto trait Bound : Copy {} // error!
 
@@ -18,7 +18,7 @@ all the existing types could implement `Bound` because very few of them have the
 To fix this issue, just remove the super trait:
 
 ```
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 
 auto trait Bound {} // ok!
 

compiler/rustc_feature/src/active.rs

@@ -149,9 +149,6 @@ declare_features! (
     /// Allows using the `#[linkage = ".."]` attribute.
     (active, linkage, "1.0.0", Some(29603), None),
 
-    /// Allows features specific to OIBIT (auto traits).
-    (active, optin_builtin_traits, "1.0.0", Some(13231), None),
-
     /// Allows using `box` in patterns (RFC 469).
     (active, box_patterns, "1.0.0", Some(29641), None),
 
@@ -215,6 +212,10 @@ declare_features! (
     /// purpose as `#[allow_internal_unstable]`.
     (active, rustc_allow_const_fn_unstable, "1.49.0", Some(69399), None),
 
+    /// Allows features specific to auto traits.
+    /// Renamed from `optin_builtin_traits`.
+    (active, auto_traits, "1.50.0", Some(13231), None),
+
     // no-tracking-issue-end
 
     // -------------------------------------------------------------------------

compiler/rustc_feature/src/removed.rs

@@ -71,6 +71,10 @@ declare_features! (
     /// Allows using custom attributes (RFC 572).
     (removed, custom_attribute, "1.0.0", Some(29642), None,
      Some("removed in favor of `#![register_tool]` and `#![register_attr]`")),
+    /// Allows features specific to OIBIT (now called auto traits).
+    /// Renamed to `auto_traits`.
+    (removed, optin_builtin_traits, "1.0.0", Some(13231), None,
+     Some("renamed to `auto_traits`")),
     (removed, pushpop_unsafe, "1.2.0", None, None, None),
     (removed, needs_allocator, "1.4.0", Some(27389), None,
      Some("subsumed by `#![feature(allocator_internals)]`")),
@@ -113,7 +117,6 @@ declare_features! (
      Some("removed in favor of `#![feature(marker_trait_attr)]`")),
     /// Allows `#[no_debug]`.
     (removed, no_debug, "1.43.0", Some(29721), None, Some("removed due to lack of demand")),
-
     /// Allows comparing raw pointers during const eval.
     (removed, const_compare_raw_pointers, "1.46.0", Some(53020), None,
      Some("cannot be allowed in const eval in any meaningful way")),

compiler/rustc_middle/src/mir/mod.rs

@@ -811,7 +811,7 @@ pub struct LocalDecl<'tcx> {
     /// after typeck.
     ///
     /// This should be sound because the drop flags are fully algebraic, and
-    /// therefore don't affect the OIBIT or outlives properties of the
+    /// therefore don't affect the auto-trait or outlives properties of the
     /// generator.
     pub internal: bool,
 

compiler/rustc_middle/src/traits/mod.rs

@@ -71,7 +71,7 @@ pub enum Reveal {
     /// be observable directly by the user, `Reveal::All`
     /// should not be used by checks which may expose
     /// type equality or type contents to the user.
-    /// There are some exceptions, e.g., around OIBITS and
+    /// There are some exceptions, e.g., around auto traits and
     /// transmute-checking, which expose some details, but
     /// not the whole concrete type of the `impl Trait`.
     All,

compiler/rustc_mir_build/src/build/expr/as_rvalue.rs

@@ -96,7 +96,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
             ExprKind::Box { value } => {
                 let value = this.hir.mirror(value);
                 // The `Box<T>` temporary created here is not a part of the HIR,
-                // and therefore is not considered during generator OIBIT
+                // and therefore is not considered during generator auto-trait
                 // determination. See the comment about `box` at `yield_in_scope`.
                 let result = this.local_decls.push(LocalDecl::new(expr.ty, expr_span).internal());
                 this.cfg.push(

compiler/rustc_span/src/symbol.rs

@@ -285,6 +285,7 @@ symbols! {
         attr_literals,
         attributes,
         augmented_assignments,
+        auto_traits,
         automatically_derived,
         avx512_target_feature,
         await_macro,

library/alloc/src/lib.rs

@@ -112,7 +112,8 @@
 #![feature(never_type)]
 #![feature(nll)]
 #![feature(nonnull_slice_from_raw_parts)]
-#![feature(optin_builtin_traits)]
+#![cfg_attr(bootstrap, feature(optin_builtin_traits))]
+#![cfg_attr(not(bootstrap), feature(auto_traits))]
 #![feature(or_patterns)]
 #![feature(pattern)]
 #![feature(ptr_internals)]

library/core/src/lib.rs

@@ -117,7 +117,8 @@
 #![feature(nll)]
 #![feature(exhaustive_patterns)]
 #![feature(no_core)]
-#![feature(optin_builtin_traits)]
+#![cfg_attr(bootstrap, feature(optin_builtin_traits))]
+#![cfg_attr(not(bootstrap), feature(auto_traits))]
 #![feature(or_patterns)]
 #![feature(prelude_import)]
 #![feature(repr_simd, platform_intrinsics)]

library/proc_macro/src/lib.rs

@@ -28,7 +28,8 @@
 #![feature(extern_types)]
 #![feature(in_band_lifetimes)]
 #![feature(negative_impls)]
-#![feature(optin_builtin_traits)]
+#![cfg_attr(bootstrap, feature(optin_builtin_traits))]
+#![cfg_attr(not(bootstrap), feature(auto_traits))]
 #![feature(restricted_std)]
 #![feature(rustc_attrs)]
 #![feature(min_specialization)]

library/rtstartup/rsbegin.rs

@@ -9,10 +9,13 @@
 // headers or footers.
 //
 // Note that the actual module entry point is located in the C runtime startup
-// object (usually called `crtX.o), which then invokes initialization callbacks
+// object (usually called `crtX.o`), which then invokes initialization callbacks
 // of other runtime components (registered via yet another special image section).
 
-#![feature(no_core, lang_items, optin_builtin_traits)]
+#![feature(no_core)]
+#![feature(lang_items)]
+#![cfg_attr(bootstrap, feature(optin_builtin_traits))]
+#![cfg_attr(not(bootstrap), feature(auto_traits))]
 #![crate_type = "rlib"]
 #![no_core]
 #![allow(non_camel_case_types)]

library/rtstartup/rsend.rs

@@ -1,6 +1,9 @@
 // See rsbegin.rs for details.
 
-#![feature(no_core, lang_items, optin_builtin_traits)]
+#![feature(no_core)]
+#![feature(lang_items)]
+#![cfg_attr(bootstrap, feature(optin_builtin_traits))]
+#![cfg_attr(not(bootstrap), feature(auto_traits))]
 #![crate_type = "rlib"]
 #![no_core]
 

library/std/src/lib.rs

@@ -286,7 +286,8 @@
 #![feature(nll)]
 #![feature(nonnull_slice_from_raw_parts)]
 #![feature(once_cell)]
-#![feature(optin_builtin_traits)]
+#![cfg_attr(bootstrap, feature(optin_builtin_traits))]
+#![cfg_attr(not(bootstrap), feature(auto_traits))]
 #![feature(or_patterns)]
 #![feature(panic_info_message)]
 #![feature(panic_internals)]

src/doc/unstable-book/src/language-features/optin-builtin-traits.md → src/doc/unstable-book/src/language-features/auto-traits.md

@@ -1,12 +1,12 @@
-# `optin_builtin_traits`
+# `auto_traits`
 
 The tracking issue for this feature is [#13231] 
 
 [#13231]: https://github.com/rust-lang/rust/issues/13231
 
 ----
 
-The `optin_builtin_traits` feature gate allows you to define auto traits.
+The `auto_traits` feature gate allows you to define auto traits.
 
 Auto traits, like [`Send`] or [`Sync`] in the standard library, are marker traits
 that are automatically implemented for every type, unless the type, or a type it contains, 
@@ -24,7 +24,7 @@ Example:
 
 ```rust
 #![feature(negative_impls)]
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 
 auto trait Valid {}
 

src/test/pretty/auto-trait.rs

@@ -1,4 +1,4 @@
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 
 // pp-exact
 

src/test/run-make-fulldeps/simd-ffi/simd.rs

@@ -2,7 +2,7 @@
 #![crate_type = "lib"]
 // we can compile to a variety of platforms, because we don't need
 // cross-compiled standard libraries.
-#![feature(no_core, optin_builtin_traits)]
+#![feature(no_core, auto_traits)]
 #![no_core]
 #![feature(repr_simd, simd_ffi, link_llvm_intrinsics, lang_items, rustc_attrs)]
 

src/test/run-make-fulldeps/target-specs/foo.rs

@@ -1,4 +1,4 @@
-#![feature(lang_items, no_core, optin_builtin_traits)]
+#![feature(lang_items, no_core, auto_traits)]
 #![no_core]
 
 #[lang="copy"]

src/test/rustdoc/auto-traits.rs

@@ -1,6 +1,6 @@
 // aux-build:auto-traits.rs
 
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 
 #![crate_name = "foo"]
 

src/test/rustdoc/auto_aliases.rs

@@ -1,4 +1,4 @@
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 
 // @has auto_aliases/trait.Bar.html '//h3[@aliases="auto_aliases::Foo"]' 'impl Bar for Foo'
 pub struct Foo;

src/test/rustdoc/auxiliary/auto-traits.rs

@@ -1,3 +1,3 @@
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 
 pub unsafe auto trait Bar {}

src/test/rustdoc/auxiliary/rustdoc-default-impl.rs

@@ -1,4 +1,4 @@
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 
 pub mod bar {
     use std::marker;

src/test/rustdoc/auxiliary/rustdoc-impl-parts-crosscrate.rs

@@ -1,3 +1,3 @@
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 
-pub auto trait AnOibit {}
+pub auto trait AnAutoTrait {}

src/test/rustdoc/impl-parts-crosscrate.rs

@@ -12,9 +12,9 @@ pub struct Bar<T> { t: T }
 // full impl string.  Instead, just make sure something from each part
 // is mentioned.
 
-// @has implementors/rustdoc_impl_parts_crosscrate/trait.AnOibit.js Bar
+// @has implementors/rustdoc_impl_parts_crosscrate/trait.AnAutoTrait.js Bar
 // @has - Send
-// @has - !AnOibit
+// @has - !AnAutoTrait
 // @has - Copy
-impl<T: Send> !rustdoc_impl_parts_crosscrate::AnOibit for Bar<T>
+impl<T: Send> !rustdoc_impl_parts_crosscrate::AnAutoTrait for Bar<T>
     where T: Copy {}

src/test/rustdoc/impl-parts.rs

@@ -1,12 +1,12 @@
 #![feature(negative_impls)]
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 
-pub auto trait AnOibit {}
+pub auto trait AnAutoTrait {}
 
 pub struct Foo<T> { field: T }
 
 // @has impl_parts/struct.Foo.html '//*[@class="impl"]//code' \
-//     "impl<T: Clone> !AnOibit for Foo<T> where T: Sync,"
-// @has impl_parts/trait.AnOibit.html '//*[@class="item-list"]//code' \
-//     "impl<T: Clone> !AnOibit for Foo<T> where T: Sync,"
-impl<T: Clone> !AnOibit for Foo<T> where T: Sync {}
+//     "impl<T: Clone> !AnAutoTrait for Foo<T> where T: Sync,"
+// @has impl_parts/trait.AnAutoTrait.html '//*[@class="item-list"]//code' \
+//     "impl<T: Clone> !AnAutoTrait for Foo<T> where T: Sync,"
+impl<T: Clone> !AnAutoTrait for Foo<T> where T: Sync {}

src/test/rustdoc/synthetic_auto/crate-local.rs

@@ -1,4 +1,4 @@
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 
 pub auto trait Banana {}
 

src/test/ui/async-await/issue-64130-3-other.rs

@@ -1,4 +1,4 @@
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 #![feature(negative_impls)]
 // edition:2018
 

src/test/ui/auto-traits/auto-trait-validation.rs

@@ -1,4 +1,4 @@
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 
 auto trait Generic<T> {}
 //~^ auto traits cannot have generic parameters [E0567]

src/test/ui/auto-traits/auto-traits.rs

@@ -1,6 +1,6 @@
 // run-pass
 #![allow(unused_doc_comments)]
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 #![feature(negative_impls)]
 
 auto trait Auto {}

src/test/ui/auto-traits/issue-23080-2.rs

@@ -1,4 +1,4 @@
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 #![feature(negative_impls)]
 
 unsafe auto trait Trait {

src/test/ui/auto-traits/issue-23080.rs

@@ -1,4 +1,4 @@
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 #![feature(negative_impls)]
 
 unsafe auto trait Trait {

src/test/ui/auto-traits/typeck-auto-trait-no-supertraits-2.rs

@@ -1,4 +1,4 @@
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 #![feature(negative_impls)]
 
 auto trait Magic : Sized where Option<Self> : Magic {} //~ ERROR E0568

src/test/ui/auto-traits/typeck-auto-trait-no-supertraits.rs

@@ -22,7 +22,7 @@
 //    println!("{:?} {:?}", a, b);
 // }
 
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 #![feature(negative_impls)]
 
 auto trait Magic: Copy {} //~ ERROR E0568

src/test/ui/auto-traits/typeck-default-trait-impl-constituent-types-2.rs

@@ -1,4 +1,4 @@
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 #![feature(negative_impls)]
 
 auto trait MyTrait {}

src/test/ui/auto-traits/typeck-default-trait-impl-constituent-types.rs

@@ -1,4 +1,4 @@
-#![feature(optin_builtin_traits)]
+#![feature(auto_traits)]
 #![feature(negative_impls)]
 
 auto trait MyTrait {}