From cad617bba054334e2172b9ef54f2ed82c6067794 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Matthias=20Kr=C3=BCger?= <matthias.krueger@famsik.de>
Date: Mon, 15 Mar 2021 10:15:08 +0100
Subject: some clippy::performance fixes

use vec![] instead of Vec::new() +  push()
avoid redundant clones
use chars instead of &str for single char patterns in ends_with() and starts_with()
allocate some Vecs with capacity to avoid unneccessary resizing
---
 crates/hir_expand/src/builtin_derive.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'crates/hir_expand/src/builtin_derive.rs')

diff --git a/crates/hir_expand/src/builtin_derive.rs b/crates/hir_expand/src/builtin_derive.rs
index dfdb9cf59..5e908b223 100644
--- a/crates/hir_expand/src/builtin_derive.rs
+++ b/crates/hir_expand/src/builtin_derive.rs
@@ -108,7 +108,7 @@ fn parse_adt(tt: &tt::Subtree) -> Result<BasicAdtInfo, mbe::ExpandError> {
 }
 
 fn make_type_args(n: usize, bound: Vec<tt::TokenTree>) -> Vec<tt::TokenTree> {
-    let mut result = Vec::<tt::TokenTree>::new();
+    let mut result = Vec::<tt::TokenTree>::with_capacity(n * 2);
     result.push(
         tt::Leaf::Punct(tt::Punct {
             char: '<',
-- 
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