From ae5ed9b72914ea28749072cbaff86bc34a43884c Mon Sep 17 00:00:00 2001
From: Mark Rousskov <mark.simulacrum@gmail.com>
Date: Fri, 5 Jul 2019 12:25:34 -0400
Subject: [PATCH] Don't re-collect tokenstream twice to pretty print

---
 src/librustc_metadata/encoder.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/librustc_metadata/encoder.rs b/src/librustc_metadata/encoder.rs
index c7f57be6426..567b6b1a891 100644
--- a/src/librustc_metadata/encoder.rs
+++ b/src/librustc_metadata/encoder.rs
@@ -1316,7 +1316,7 @@ impl EncodeContext<'tcx> {
         let def_id = self.tcx.hir().local_def_id(macro_def.hir_id);
         Entry {
             kind: EntryKind::MacroDef(self.lazy(&MacroDef {
-                body: pprust::tts_to_string(&macro_def.body.trees().collect::<Vec<_>>()),
+                body: pprust::tokens_to_string(macro_def.body.clone()),
                 legacy: macro_def.legacy,
             })),
             visibility: self.lazy(&ty::Visibility::Public),