Use iter::zip in compiler/

compiler/rustc_errors/src/emitter.rs

@@ -2214,9 +2214,7 @@ pub fn is_case_difference(sm: &SourceMap, suggested: &str, sp: Span) -> bool {
     };
     let ascii_confusables = &['c', 'f', 'i', 'k', 'o', 's', 'u', 'v', 'w', 'x', 'y', 'z'];
     // All the chars that differ in capitalization are confusable (above):
-    let confusable = found
-        .chars()
-        .zip(suggested.chars())
+    let confusable = iter::zip(found.chars(), suggested.chars())
         .filter(|(f, s)| f != s)
         .all(|(f, s)| (ascii_confusables.contains(&f) || ascii_confusables.contains(&s)));
     confusable && found.to_lowercase() == suggested.to_lowercase()

compiler/rustc_errors/src/lib.rs

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

compiler/rustc_errors/src/styled_buffer.rs

@@ -1,6 +1,7 @@
 // Code for creating styled buffers
 
 use crate::snippet::{Style, StyledString};
+use std::iter;
 
 #[derive(Debug)]
 pub struct StyledBuffer {
@@ -20,11 +21,11 @@ impl StyledBuffer {
         let mut output: Vec<Vec<StyledString>> = vec![];
         let mut styled_vec: Vec<StyledString> = vec![];
 
-        for (row, row_style) in self.text.iter().zip(&self.styles) {
+        for (row, row_style) in iter::zip(&self.text, &self.styles) {
             let mut current_style = Style::NoStyle;
             let mut current_text = String::new();
 
-            for (&c, &s) in row.iter().zip(row_style) {
+            for (&c, &s) in iter::zip(row, row_style) {
                 if s != current_style {
                     if !current_text.is_empty() {
                         styled_vec.push(StyledString { text: current_text, style: current_style });