Rollup merge of #82917 - cuviper:iter-zip, r=m-ou-se

Add function core::iter::zip

This makes it a little easier to `zip` iterators:

```rust
for (x, y) in zip(xs, ys) {}
// vs.
for (x, y) in xs.into_iter().zip(ys) {}
```

You can `zip(&mut xs, &ys)` for the conventional `iter_mut()` and
`iter()`, respectively. This can also support arbitrary nesting, where
it's easier to see the item layout than with arbitrary `zip` chains:

```rust
for ((x, y), z) in zip(zip(xs, ys), zs) {}
for (x, (y, z)) in zip(xs, zip(ys, zs)) {}
// vs.
for ((x, y), z) in xs.into_iter().zip(ys).zip(xz) {}
for (x, (y, z)) in xs.into_iter().zip((ys.into_iter().zip(xz)) {}
```

It may also format more nicely, especially when the first iterator is a
longer chain of methods -- for example:

```rust
    iter::zip(
        trait_ref.substs.types().skip(1),
        impl_trait_ref.substs.types().skip(1),
    )
    // vs.
    trait_ref
        .substs
        .types()
        .skip(1)
        .zip(impl_trait_ref.substs.types().skip(1))
```

This replaces the tuple-pair `IntoIterator` in #78204.
There is prior art for the utility of this in [`itertools::zip`].

[`itertools::zip`]: https://docs.rs/itertools/0.10.0/itertools/fn.zip.html

2 files changed, 2 insertions, 3 deletions

diff --git a/compiler/rustc_codegen_ssa/src/lib.rs b/compiler/rustc_codegen_ssa/src/lib.rs
index 6eead2812ba..56b4ef79383 100644
--- a/compiler/rustc_codegen_ssa/src/lib.rs
+++ b/compiler/rustc_codegen_ssa/src/lib.rs
@@ -8,6 +8,7 @@
 #![feature(nll)]
 #![cfg_attr(bootstrap, feature(or_patterns))]
 #![feature(associated_type_bounds)]
+#![feature(iter_zip)]
 #![recursion_limit = "256"]
 #![feature(box_syntax)]
 
diff --git a/compiler/rustc_codegen_ssa/src/mir/mod.rs b/compiler/rustc_codegen_ssa/src/mir/mod.rs
index 3f945478213..91df67b53d2 100644
--- a/compiler/rustc_codegen_ssa/src/mir/mod.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/mod.rs
@@ -282,9 +282,7 @@ fn create_funclets<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
     IndexVec<mir::BasicBlock, Option<Bx::BasicBlock>>,
     IndexVec<mir::BasicBlock, Option<Bx::Funclet>>,
 ) {
-    block_bxs
-        .iter_enumerated()
-        .zip(cleanup_kinds)
+    iter::zip(block_bxs.iter_enumerated(), cleanup_kinds)
         .map(|((bb, &llbb), cleanup_kind)| {
             match *cleanup_kind {
                 CleanupKind::Funclet if base::wants_msvc_seh(bx.sess()) => {}