From 7e0fa715329571da8d5d551b1815303c39cf51c1 Mon Sep 17 00:00:00 2001
From: Shotaro Yamada <sinkuu@sinkuu.xyz>
Date: Wed, 25 Sep 2019 10:30:33 +0900
Subject: Avoid intermediate allocation

---
 crates/ra_hir/src/ty.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/ra_hir/src/ty.rs b/crates/ra_hir/src/ty.rs
index e6ecbe1ea..fae9c1e22 100644
--- a/crates/ra_hir/src/ty.rs
+++ b/crates/ra_hir/src/ty.rs
@@ -223,7 +223,7 @@ impl Substs {
     }
 
     pub fn prefix(&self, n: usize) -> Substs {
-        Substs(self.0.iter().cloned().take(n).collect::<Vec<_>>().into())
+        Substs(self.0[..std::cmp::min(self.0.len(), n)].into())
     }
 
     pub fn walk(&self, f: &mut impl FnMut(&Ty)) {
-- 
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