From ad471452ba6fbbf91ad566dc4bdf1033a7281811 Mon Sep 17 00:00:00 2001
From: Nicholas Nethercote <nnethercote@mozilla.com>
Date: Fri, 18 May 2018 16:19:35 +1000
Subject: Make `Directory::path` a `Cow`.

Because we create a lot of these in the macro parser, but only very
rarely modify them.

This speeds up some html5ever runs by 2--3%.
---
 src/libsyntax/parse/mod.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'src/libsyntax/parse/mod.rs')

diff --git a/src/libsyntax/parse/mod.rs b/src/libsyntax/parse/mod.rs
index f26a6a53074..0abedb99bd0 100644
--- a/src/libsyntax/parse/mod.rs
+++ b/src/libsyntax/parse/mod.rs
@@ -23,6 +23,7 @@ use symbol::Symbol;
 use tokenstream::{TokenStream, TokenTree};
 use diagnostics::plugin::ErrorMap;
 
+use std::borrow::Cow;
 use std::collections::HashSet;
 use std::iter;
 use std::path::{Path, PathBuf};
@@ -89,8 +90,8 @@ impl ParseSess {
 }
 
 #[derive(Clone)]
-pub struct Directory {
-    pub path: PathBuf,
+pub struct Directory<'a> {
+    pub path: Cow<'a, Path>,
     pub ownership: DirectoryOwnership,
 }
 
-- 
cgit 1.4.1-3-g733a5