From d2b23599b6ac0b79fff0efe4946e098f3f04c1cb Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Tue, 4 Jun 2019 14:46:22 +0300
Subject: fix debug scopes

---
 crates/ra_prof/src/lib.rs | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/crates/ra_prof/src/lib.rs b/crates/ra_prof/src/lib.rs
index 6ec24d86d..de67b4031 100644
--- a/crates/ra_prof/src/lib.rs
+++ b/crates/ra_prof/src/lib.rs
@@ -236,13 +236,13 @@ thread_local!(static IN_SCOPE: RefCell<bool> = RefCell::new(false));
 /// Allows to check if the current code is withing some dynamic scope, can be
 /// useful during debugging to figure out why a function is called.
 pub struct Scope {
-    _hidden: (),
+    prev: bool,
 }
 
 impl Scope {
     pub fn enter() -> Scope {
-        IN_SCOPE.with(|slot| *slot.borrow_mut() = true);
-        Scope { _hidden: () }
+        let prev = IN_SCOPE.with(|slot| std::mem::replace(&mut *slot.borrow_mut(), true));
+        Scope { prev }
     }
     pub fn is_active() -> bool {
         IN_SCOPE.with(|slot| *slot.borrow())
@@ -251,7 +251,7 @@ impl Scope {
 
 impl Drop for Scope {
     fn drop(&mut self) {
-        IN_SCOPE.with(|slot| *slot.borrow_mut() = false);
+        IN_SCOPE.with(|slot| *slot.borrow_mut() = self.prev);
     }
 }
 
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