Use str::repeat

src/chains.rs

@@ -104,7 +104,7 @@ pub fn rewrite_chain(expr: &ast::Expr, context: &RewriteContext, shape: Shape) -
     };
     let parent_rewrite = parent
         .rewrite(context, parent_shape)
-        .map(|parent_rw| parent_rw + &repeat_try(prefix_try_num))?;
+        .map(|parent_rw| parent_rw + &"?".repeat(prefix_try_num))?;
     let parent_rewrite_contains_newline = parent_rewrite.contains('\n');
     let is_small_parent = parent_rewrite.len() <= context.config.tab_spaces();
 
@@ -297,7 +297,7 @@ pub fn rewrite_chain(expr: &ast::Expr, context: &RewriteContext, shape: Shape) -
             join_rewrites(&rewrites, &connector)
         )
     };
-    let result = format!("{}{}", result, repeat_try(suffix_try_num));
+    let result = format!("{}{}", result, "?".repeat(suffix_try_num));
     if context.config.indent_style() == IndentStyle::Visual {
         wrap_str(result, context.config.max_width(), shape)
     } else {
@@ -318,10 +318,6 @@ fn chain_only_try(exprs: &[ast::Expr]) -> bool {
 
 // Try to rewrite and replace the last non-try child. Return `true` if
 // replacing succeeds.
-fn repeat_try(try_count: usize) -> String {
-    iter::repeat("?").take(try_count).collect::<String>()
-}
-
 fn rewrite_try(
     expr: &ast::Expr,
     try_count: usize,
@@ -329,7 +325,7 @@ fn rewrite_try(
     shape: Shape,
 ) -> Option<String> {
     let sub_expr = expr.rewrite(context, shape.sub_width(try_count)?)?;
-    Some(format!("{}{}", sub_expr, repeat_try(try_count)))
+    Some(format!("{}{}", sub_expr, "?".repeat(try_count)))
 }
 
 fn join_rewrites(rewrites: &[String], connector: &str) -> String {

src/lib.rs

@@ -34,7 +34,6 @@ extern crate unicode_segmentation;
 use std::collections::HashMap;
 use std::fmt;
 use std::io::{self, stdout, BufRead, Write};
-use std::iter::repeat;
 use std::panic::{catch_unwind, AssertUnwindSafe};
 use std::path::PathBuf;
 use std::rc::Rc;
@@ -200,7 +199,7 @@ impl FormatReport {
         for (file, errors) in &self.file_error_map {
             for error in errors {
                 let prefix_space_len = error.line.to_string().len();
-                let prefix_spaces: String = repeat(" ").take(1 + prefix_space_len).collect();
+                let prefix_spaces = " ".repeat(1 + prefix_space_len);
 
                 // First line: the overview of error
                 t.fg(term::color::RED)?;
@@ -259,8 +258,8 @@ impl FormatReport {
 }
 
 fn target_str(space_len: usize, target_len: usize) -> String {
-    let empty_line: String = repeat(" ").take(space_len).collect();
-    let overflowed: String = repeat("^").take(target_len).collect();
+    let empty_line = " ".repeat(space_len);
+    let overflowed = "^".repeat(target_len);
     empty_line + &overflowed
 }
 
@@ -270,7 +269,7 @@ impl fmt::Display for FormatReport {
         for (file, errors) in &self.file_error_map {
             for error in errors {
                 let prefix_space_len = error.line.to_string().len();
-                let prefix_spaces: String = repeat(" ").take(1 + prefix_space_len).collect();
+                let prefix_spaces = " ".repeat(1 + prefix_space_len);
 
                 let error_line_buffer = if error.line_buffer.is_empty() {
                     String::from(" ")

src/missed_spans.rs

@@ -9,7 +9,6 @@
 // except according to those terms.
 
 use std::borrow::Cow;
-use std::iter::repeat;
 
 use syntax::codemap::{BytePos, FileName, Pos, Span};
 
@@ -122,7 +121,7 @@ impl<'a> FmtVisitor<'a> {
             }
         }
 
-        let blank_lines: String = repeat('\n').take(newline_count).collect();
+        let blank_lines = "\n".repeat(newline_count);
         self.push_str(&blank_lines);
     }