From b606399095cc5357a93f40fb0d695eab8530bc98 Mon Sep 17 00:00:00 2001
From: Simon Vandel Sillesen <simon.vandel@gmail.com>
Date: Sat, 16 May 2020 18:24:17 +0200
Subject: Reduce reallocations in ra_tt::buffer::TokenBuffer::new_inner

---
 crates/ra_tt/src/buffer.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'crates/ra_tt/src/buffer.rs')

diff --git a/crates/ra_tt/src/buffer.rs b/crates/ra_tt/src/buffer.rs
index 14b3f707d..5967f44cd 100644
--- a/crates/ra_tt/src/buffer.rs
+++ b/crates/ra_tt/src/buffer.rs
@@ -42,7 +42,9 @@ impl<'t> TokenBuffer<'t> {
         buffers: &mut Vec<Box<[Entry<'t>]>>,
         next: Option<EntryPtr>,
     ) -> usize {
-        let mut entries = vec![];
+        // Must contain everything in tokens and then the Entry::End
+        let start_capacity = tokens.len() + 1;
+        let mut entries = Vec::with_capacity(start_capacity);
         let mut children = vec![];
 
         for (idx, tt) in tokens.iter().enumerate() {
-- 
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