Rollup merge of #91881 - Patrick-Poitras:stabilize-iter-zip, r=scottmcm

Stabilize `iter::zip`

Hello all!

As the tracking issue (#83574) for `iter::zip` completed the final commenting period without any concerns being raised, I hereby submit this stabilization PR on the issue.

As the pull request that introduced the feature (#82917) states, the `iter::zip` function is a shorter way to zip two iterators. As it's generally a quality-of-life/ergonomic improvement, it has been integrated into the codebase without any trouble, and has been
used in many places across the rust compiler and standard library since March without any issues.

For more details, I would refer to `@cuviper's` original PR, or the [function's documentation](https://doc.rust-lang.org/std/iter/fn.zip.html).

compiler/rustc_apfloat/src/lib.rs

@@ -33,7 +33,6 @@
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![no_std]
 #![forbid(unsafe_code)]
-#![feature(iter_zip)]
 #![feature(nll)]
 
 #[macro_use]

compiler/rustc_ast/src/lib.rs

@@ -11,7 +11,6 @@
 #![feature(box_patterns)]
 #![feature(crate_visibility_modifier)]
 #![feature(if_let_guard)]
-#![feature(iter_zip)]
 #![feature(label_break_value)]
 #![feature(nll)]
 #![feature(min_specialization)]

compiler/rustc_ast_lowering/src/lib.rs

@@ -32,7 +32,6 @@
 
 #![feature(crate_visibility_modifier)]
 #![feature(box_patterns)]
-#![feature(iter_zip)]
 #![feature(never_type)]
 #![recursion_limit = "256"]
 

compiler/rustc_borrowck/src/lib.rs

@@ -4,7 +4,6 @@
 #![feature(box_patterns)]
 #![feature(crate_visibility_modifier)]
 #![feature(in_band_lifetimes)]
-#![feature(iter_zip)]
 #![feature(let_else)]
 #![feature(min_specialization)]
 #![feature(stmt_expr_attributes)]

compiler/rustc_builtin_macros/src/lib.rs

@@ -6,7 +6,6 @@
 #![feature(bool_to_option)]
 #![feature(crate_visibility_modifier)]
 #![feature(decl_macro)]
-#![feature(iter_zip)]
 #![feature(nll)]
 #![feature(proc_macro_internals)]
 #![feature(proc_macro_quote)]

compiler/rustc_codegen_llvm/src/lib.rs

@@ -9,7 +9,6 @@
 #![feature(crate_visibility_modifier)]
 #![feature(extern_types)]
 #![feature(in_band_lifetimes)]
-#![feature(iter_zip)]
 #![feature(nll)]
 #![recursion_limit = "256"]
 

compiler/rustc_const_eval/src/lib.rs

@@ -11,7 +11,6 @@ Rust MIR: a lowered representation of Rust.
 #![feature(crate_visibility_modifier)]
 #![feature(decl_macro)]
 #![feature(exact_size_is_empty)]
-#![feature(iter_zip)]
 #![feature(let_else)]
 #![feature(map_try_insert)]
 #![feature(min_specialization)]

compiler/rustc_errors/src/lib.rs

@@ -6,7 +6,6 @@
 #![feature(crate_visibility_modifier)]
 #![feature(backtrace)]
 #![feature(if_let_guard)]
-#![feature(iter_zip)]
 #![feature(let_else)]
 #![feature(nll)]
 

compiler/rustc_expand/src/lib.rs

@@ -2,7 +2,6 @@
 #![feature(decl_macro)]
 #![feature(destructuring_assignment)]
 #![feature(if_let_guard)]
-#![feature(iter_zip)]
 #![feature(let_else)]
 #![feature(proc_macro_diagnostic)]
 #![feature(proc_macro_internals)]

compiler/rustc_index/src/lib.rs

@@ -1,7 +1,6 @@
 #![feature(allow_internal_unstable)]
 #![feature(bench_black_box)]
 #![feature(extend_one)]
-#![feature(iter_zip)]
 #![feature(min_specialization)]
 #![feature(step_trait)]
 #![feature(test)]

compiler/rustc_infer/src/lib.rs

@@ -17,7 +17,6 @@
 #![feature(box_patterns)]
 #![feature(derive_default_enum)]
 #![feature(extend_one)]
-#![feature(iter_zip)]
 #![feature(let_else)]
 #![feature(never_type)]
 #![feature(in_band_lifetimes)]

compiler/rustc_lint/src/lib.rs

@@ -31,7 +31,6 @@
 #![feature(box_patterns)]
 #![feature(crate_visibility_modifier)]
 #![feature(iter_order_by)]
-#![feature(iter_zip)]
 #![feature(let_else)]
 #![feature(never_type)]
 #![feature(nll)]

compiler/rustc_middle/src/lib.rs

@@ -51,7 +51,6 @@
 #![feature(half_open_range_patterns)]
 #![feature(control_flow_enum)]
 #![feature(associated_type_defaults)]
-#![feature(iter_zip)]
 #![feature(trusted_step)]
 #![feature(try_blocks)]
 #![feature(try_reserve_kind)]

compiler/rustc_mir_build/src/lib.rs

@@ -5,7 +5,6 @@
 #![feature(control_flow_enum)]
 #![feature(crate_visibility_modifier)]
 #![feature(bool_to_option)]
-#![feature(iter_zip)]
 #![feature(let_else)]
 #![feature(once_cell)]
 #![feature(min_specialization)]

compiler/rustc_mir_dataflow/src/lib.rs

@@ -4,7 +4,6 @@
 #![feature(box_syntax)]
 #![feature(exact_size_is_empty)]
 #![feature(in_band_lifetimes)]
-#![feature(iter_zip)]
 #![feature(let_else)]
 #![feature(min_specialization)]
 #![feature(once_cell)]

compiler/rustc_mir_transform/src/lib.rs

@@ -1,7 +1,6 @@
 #![feature(box_patterns)]
 #![feature(box_syntax)]
 #![feature(crate_visibility_modifier)]
-#![feature(iter_zip)]
 #![feature(let_else)]
 #![feature(map_try_insert)]
 #![feature(min_specialization)]

compiler/rustc_passes/src/lib.rs

@@ -7,7 +7,6 @@
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![feature(crate_visibility_modifier)]
 #![feature(in_band_lifetimes)]
-#![feature(iter_zip)]
 #![feature(map_try_insert)]
 #![feature(min_specialization)]
 #![feature(nll)]

compiler/rustc_query_system/src/lib.rs

@@ -2,7 +2,6 @@
 #![feature(bool_to_option)]
 #![feature(core_intrinsics)]
 #![feature(hash_raw_entry)]
-#![feature(iter_zip)]
 #![feature(let_else)]
 #![feature(min_specialization)]
 #![feature(extern_types)]

compiler/rustc_resolve/src/lib.rs

@@ -13,7 +13,6 @@
 #![feature(drain_filter)]
 #![feature(bool_to_option)]
 #![feature(crate_visibility_modifier)]
-#![feature(iter_zip)]
 #![feature(let_else)]
 #![feature(never_type)]
 #![feature(nll)]

compiler/rustc_symbol_mangling/src/lib.rs

@@ -91,7 +91,6 @@
 #![feature(never_type)]
 #![feature(nll)]
 #![feature(in_band_lifetimes)]
-#![feature(iter_zip)]
 #![recursion_limit = "256"]
 
 #[macro_use]

compiler/rustc_trait_selection/src/lib.rs

@@ -17,7 +17,6 @@
 #![feature(derive_default_enum)]
 #![feature(hash_drain_filter)]
 #![feature(in_band_lifetimes)]
-#![feature(iter_zip)]
 #![feature(let_else)]
 #![feature(never_type)]
 #![feature(crate_visibility_modifier)]

compiler/rustc_typeck/src/lib.rs

@@ -61,7 +61,6 @@ This API is completely unstable and subject to change.
 #![feature(if_let_guard)]
 #![feature(in_band_lifetimes)]
 #![feature(is_sorted)]
-#![feature(iter_zip)]
 #![feature(let_else)]
 #![feature(min_specialization)]
 #![feature(nll)]

library/alloc/src/lib.rs

@@ -107,7 +107,6 @@
 #![feature(inherent_ascii_escape)]
 #![feature(inplace_iteration)]
 #![feature(iter_advance_by)]
-#![feature(iter_zip)]
 #![feature(layout_for_ptr)]
 #![feature(maybe_uninit_extra)]
 #![feature(maybe_uninit_slice)]

library/core/src/iter/adapters/mod.rs

@@ -54,7 +54,7 @@ pub use self::zip::TrustedRandomAccess;
 #[unstable(feature = "trusted_random_access", issue = "none")]
 pub use self::zip::TrustedRandomAccessNoCoerce;
 
-#[unstable(feature = "iter_zip", issue = "83574")]
+#[stable(feature = "iter_zip", since = "1.59.0")]
 pub use self::zip::zip;
 
 /// This trait provides transitive access to source-stage in an iterator-adapter pipeline

library/core/src/iter/adapters/zip.rs

@@ -40,7 +40,6 @@ impl<A: Iterator, B: Iterator> Zip<A, B> {
 /// # Examples
 ///
 /// ```
-/// #![feature(iter_zip)]
 /// use std::iter::zip;
 ///
 /// let xs = [1, 2, 3];
@@ -63,7 +62,7 @@ impl<A: Iterator, B: Iterator> Zip<A, B> {
 /// assert_eq!(iter.next().unwrap(), ((3, 6), 9));
 /// assert!(iter.next().is_none());
 /// ```
-#[unstable(feature = "iter_zip", issue = "83574")]
+#[stable(feature = "iter_zip", since = "1.59.0")]
 pub fn zip<A, B>(a: A, b: B) -> Zip<A::IntoIter, B::IntoIter>
 where
     A: IntoIterator,

library/core/src/iter/mod.rs

@@ -391,7 +391,7 @@ pub use self::traits::{
     DoubleEndedIterator, ExactSizeIterator, Extend, FromIterator, IntoIterator, Product, Sum,
 };
 
-#[unstable(feature = "iter_zip", issue = "83574")]
+#[stable(feature = "iter_zip", since = "1.59.0")]
 pub use self::adapters::zip;
 #[stable(feature = "iter_cloned", since = "1.1.0")]
 pub use self::adapters::Cloned;

library/std/src/lib.rs

@@ -292,7 +292,6 @@
 #![feature(int_log)]
 #![feature(into_future)]
 #![feature(intra_doc_pointers)]
-#![feature(iter_zip)]
 #![feature(lang_items)]
 #![feature(linkage)]
 #![feature(llvm_asm)]

src/tools/clippy/clippy_lints/src/lib.rs

@@ -3,7 +3,6 @@
 #![feature(box_patterns)]
 #![feature(drain_filter)]
 #![feature(in_band_lifetimes)]
-#![feature(iter_zip)]
 #![feature(once_cell)]
 #![feature(rustc_private)]
 #![feature(stmt_expr_attributes)]

src/tools/clippy/clippy_utils/src/lib.rs

@@ -1,6 +1,5 @@
 #![feature(box_patterns)]
 #![feature(in_band_lifetimes)]
-#![feature(iter_zip)]
 #![feature(let_else)]
 #![feature(rustc_private)]
 #![feature(control_flow_enum)]