diff --git a/.cargo/config b/.cargo/config
index a55bec77bc66a803a1ead7773e136423a7234ed4..ec3e4e9f9f4e09c6ef0c1c02ce2667e97db68b91 100644
--- a/.cargo/config
+++ b/.cargo/config
@@ -25,7 +25,7 @@ rustflags = [
   # "-C", "link-arg=-nostartfiles",
 
   # uncomment for unchecked wrapping arithmetics also in dev mode
-  "-Z", "force-overflow-checks=off",
+  # "-Z", "force-overflow-checks=off",
 ]
 
 [build]
diff --git a/examples/bare2.rs b/examples/bare2.rs
index c039a6ef1e8ff1ed8d164f6c4ecdb1155684126a..291bb67bff29cad19c6fd44a7d20113382cf8c7b 100644
--- a/examples/bare2.rs
+++ b/examples/bare2.rs
@@ -71,18 +71,26 @@ fn main() -> ! {
 //
 //    What is the output in the ITM console?
 //
-//    ** your answer here **
+//    ** 
+// [2019-02-21T12:23:01.072Z]   bare2
+// [2019-02-21T12:23:29.117Z]   Start 42606
+// [2019-02-21T12:23:29.118Z]   End 448042815
+//  **
 //
 //    Rebuild and run in release mode
 //
 //    > cargo build --example bare2 --release
 //
-//    ** your answer here **
+//    ** 
+// [2019-02-21T12:30:44.941Z]   bare2
+// [2019-02-21T12:30:45.142Z]   Start 3057860134
+// [2019-02-21T12:30:45.142Z]   End 3061860142
+//  **
 //
 //    Compute the ratio between debug/release optimized code
 //    (the speedup).
 //
-//    ** your answer here **
+//    ** 448000209 / 4000008 = 111,99982825 times **
 //
 // commit your answers (bare2_1)
 //