From a1dfa0f230bb6dd9ca0a272d1bf884d010229be4 Mon Sep 17 00:00:00 2001
From: marmeladema <xademax@gmail.com>
Date: Sun, 16 Aug 2020 00:21:14 +0100
Subject: [PATCH] Only measure time spent dropping the AST

---
 src/librustc_driver/lib.rs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/librustc_driver/lib.rs b/src/librustc_driver/lib.rs
index cc954cee907..982bccb79b4 100644
--- a/src/librustc_driver/lib.rs
+++ b/src/librustc_driver/lib.rs
@@ -348,8 +348,10 @@ pub fn run_compiler(
             queries.global_ctxt()?;
 
             // Drop AST after creating GlobalCtxt to free memory
-            let _timer = sess.prof.generic_activity("drop_ast");
-            mem::drop(queries.expansion()?.take());
+            {
+                let _timer = sess.prof.generic_activity("drop_ast");
+                mem::drop(queries.expansion()?.take());
+            }
 
             if sess.opts.debugging_opts.no_analysis || sess.opts.debugging_opts.ast_json {
                 return early_exit();