From f87cf895c2062cb5d71e97cd3221d101c825c8af Mon Sep 17 00:00:00 2001
From: Devyn Cairns <devyn.cairns@gmail.com>
Date: Wed, 10 Jul 2024 19:13:35 -0700
Subject: [PATCH] Set the capacity of the Vec used in `gather_captures()` to
 the number of captures expected (#13339)

# Description

Just more efficient allocation during `Stack::gather_captures()` so that
we don't have to grow the `Vec` needlessly.

# User-Facing Changes
Slightly better performance.
---
 crates/nu-protocol/src/engine/stack.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/nu-protocol/src/engine/stack.rs b/crates/nu-protocol/src/engine/stack.rs
index 9315744dfb..e963227ca8 100644
--- a/crates/nu-protocol/src/engine/stack.rs
+++ b/crates/nu-protocol/src/engine/stack.rs
@@ -277,7 +277,7 @@ impl Stack {
     }
 
     pub fn gather_captures(&self, engine_state: &EngineState, captures: &[VarId]) -> Stack {
-        let mut vars = vec![];
+        let mut vars = Vec::with_capacity(captures.len());
 
         let fake_span = Span::new(0, 0);