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

compiler/rustc_expand/src/lib.rs

@@ -2,6 +2,7 @@
 #![feature(crate_visibility_modifier)]
 #![feature(decl_macro)]
 #![feature(destructuring_assignment)]
+#![feature(iter_zip)]
 #![cfg_attr(bootstrap, feature(or_patterns))]
 #![feature(proc_macro_diagnostic)]
 #![feature(proc_macro_internals)]

compiler/rustc_expand/src/mbe/macro_check.rs

@@ -116,6 +116,8 @@ use rustc_span::{symbol::MacroRulesNormalizedIdent, MultiSpan, Span};
 
 use smallvec::SmallVec;
 
+use std::iter;
+
 /// Stack represented as linked list.
 ///
 /// Those are used for environments because they grow incrementally and are not mutable.
@@ -204,7 +206,7 @@ pub(super) fn check_meta_variables(
         sess.span_diagnostic.span_bug(span, "length mismatch between LHSes and RHSes")
     }
     let mut valid = true;
-    for (lhs, rhs) in lhses.iter().zip(rhses.iter()) {
+    for (lhs, rhs) in iter::zip(lhses, rhses) {
         let mut binders = Binders::default();
         check_binders(sess, node_id, lhs, &Stack::Empty, &mut binders, &Stack::Empty, &mut valid);
         check_occurrences(sess, node_id, rhs, &Stack::Empty, &binders, &Stack::Empty, &mut valid);