Use iter::zip in compiler/

compiler/rustc_passes/src/lib.rs

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

compiler/rustc_passes/src/liveness.rs

@@ -103,6 +103,7 @@ use rustc_span::Span;
 use std::collections::VecDeque;
 use std::io;
 use std::io::prelude::*;
+use std::iter;
 use std::rc::Rc;
 
 mod rwu_table;
@@ -1093,7 +1094,7 @@ impl<'a, 'tcx> Liveness<'a, 'tcx> {
                 let ia = &asm.inner;
                 let outputs = asm.outputs_exprs;
                 let inputs = asm.inputs_exprs;
-                let succ = ia.outputs.iter().zip(outputs).rev().fold(succ, |succ, (o, output)| {
+                let succ = iter::zip(&ia.outputs, outputs).rev().fold(succ, |succ, (o, output)| {
                     // see comment on places
                     // in propagate_through_place_components()
                     if o.is_indirect {
@@ -1344,7 +1345,7 @@ fn check_expr<'tcx>(this: &mut Liveness<'_, 'tcx>, expr: &'tcx Expr<'tcx>) {
             }
 
             // Output operands must be places
-            for (o, output) in asm.inner.outputs.iter().zip(asm.outputs_exprs) {
+            for (o, output) in iter::zip(&asm.inner.outputs, asm.outputs_exprs) {
                 if !o.is_indirect {
                     this.check_place(output);
                 }

compiler/rustc_passes/src/liveness/rwu_table.rs

@@ -1,4 +1,5 @@
 use crate::liveness::{LiveNode, Variable};
+use std::iter;
 
 #[derive(Clone, Copy)]
 pub(super) struct RWU {
@@ -91,7 +92,7 @@ impl RWUTable {
 
         let mut changed = false;
         let (dst_row, src_row) = self.pick2_rows_mut(dst, src);
-        for (dst_word, src_word) in dst_row.iter_mut().zip(src_row.iter()) {
+        for (dst_word, src_word) in iter::zip(dst_row, &*src_row) {
             let old = *dst_word;
             let new = *dst_word | src_word;
             *dst_word = new;

compiler/rustc_passes/src/stability.rs

@@ -22,6 +22,7 @@ use rustc_span::symbol::{sym, Symbol};
 use rustc_span::{Span, DUMMY_SP};
 
 use std::cmp::Ordering;
+use std::iter;
 use std::mem::replace;
 use std::num::NonZeroU32;
 
@@ -214,7 +215,7 @@ impl<'a, 'tcx> Annotator<'a, 'tcx> {
             {
                 // Explicit version of iter::order::lt to handle parse errors properly
                 for (dep_v, stab_v) in
-                    dep_since.as_str().split('.').zip(stab_since.as_str().split('.'))
+                    iter::zip(dep_since.as_str().split('.'), stab_since.as_str().split('.'))
                 {
                     match stab_v.parse::<u64>() {
                         Err(_) => {