fix checking Mut access on frozen location

diff --git a/ralf/_posts/2018-08-07-stacked-borrows.md b/ralf/_posts/2018-08-07-stacked-borrows.md
index 94f2bb6689b7b1bd51b63c089755900ac76d09fc..37cdf504668b6fbb2ce48d9819c586125a2a34de 100644 (file)
--- a/ralf/_posts/2018-08-07-stacked-borrows.md
+++ b/ralf/_posts/2018-08-07-stacked-borrows.md
@@ -336,8 +336,11 @@ impl MemoryByte {
         self.frz_since.map_or(false, |loc_t| loc_t <= acc_t),
       Mut(acc_m) =>
         // Raw pointers are fine with frozen locations. This is important because &Cell is raw!
         self.frz_since.map_or(false, |loc_t| loc_t <= acc_t),
       Mut(acc_m) =>
         // Raw pointers are fine with frozen locations. This is important because &Cell is raw!

-        (acc_m.is_raw() && self.frozen_since.is_some()) ||
-        self.borrows.last().map_or(false, |loc_itm| loc_itm == Mut(acc_m)),
+        if self.frozen_since.is_some() {
+          acc_m.is_raw()
+        } else {
+          self.borrows.last().map_or(false, |loc_itm| loc_itm == Mut(acc_m))
+        }

     }
   }
 
     }
   }