Reduce allocations

jorickert · Oct 15, 2018 · 6c964fd · 6c964fd
1 parent 6fb188b
commit 6c964fd
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Showing 3 changed files with 6 additions and 6 deletions.
diff --git a/src/comment.rs b/src/comment.rs
@@ -764,12 +764,12 @@ fn trim_custom_comment_prefix(s: &str) -> String {
                 // due to comment wrapping, a line that was originaly behind `#` is split over
                 // multiple lines, which needs then to be prefixed with a `#`
                 if !orig.trim_left().starts_with("# ") {
-                    format!("# {}", orig)
+                    Cow::from(format!("# {}", orig))
                 } else {
-                    orig.to_string()
+                    Cow::from(orig)
                 }
             } else {
-                line.to_string()
+                Cow::from(line)
             }
         })
         .collect::<Vec<_>>()

diff --git a/src/config/config_type.rs b/src/config/config_type.rs
@@ -112,7 +112,7 @@ macro_rules! create_config {
                 cloned.width_heuristics = None;
 
                 ::toml::to_string(&cloned)
-                    .map_err(|e| format!("Could not output config: {}", e.to_string()))
+                    .map_err(|e| format!("Could not output config: {}", e))
             }
         }
 

diff --git a/src/items.rs b/src/items.rs
@@ -779,7 +779,7 @@ pub fn format_impl(
             let outer_indent_str = offset.block_only().to_string_with_newline(context.config);
 
             result.push_str(&inner_indent_str);
-            result.push_str(visitor.buffer.to_string().trim());
+            result.push_str(visitor.buffer.trim());
             result.push_str(&outer_indent_str);
         } else if need_newline || !context.config.empty_item_single_line() {
             result.push_str(&sep);
@@ -1137,7 +1137,7 @@ pub fn format_trait(context: &RewriteContext, item: &ast::Item, offset: Indent)
             let inner_indent_str = visitor.block_indent.to_string_with_newline(context.config);
 
             result.push_str(&inner_indent_str);
-            result.push_str(visitor.buffer.to_string().trim());
+            result.push_str(visitor.buffer.trim());
             result.push_str(&outer_indent_str);
         } else if result.contains('\n') {
             result.push_str(&outer_indent_str);