slightly improve protector-related error messages

[rust.git] / tests / fail / stacked_borrows / aliasing_mut4.stderr

diff --git a/tests/fail/stacked_borrows/aliasing_mut4.stderr b/tests/fail/stacked_borrows/aliasing_mut4.stderr
index 13b589b94754fe448ac0bfb991dce9efbb65b81c..601422ece3020c59a40aa5a4733cceea044023f5 100644 (file)
--- a/tests/fail/stacked_borrows/aliasing_mut4.stderr
+++ b/tests/fail/stacked_borrows/aliasing_mut4.stderr
@@ -1,26 +1,27 @@
-error: Undefined Behavior: not granting access to tag <TAG> because incompatible item is protected: [SharedReadOnly for <TAG> (call ID)]
+error: Undefined Behavior: not granting access to tag <TAG> because incompatible item [SharedReadOnly for <TAG>] is protected by call ID
   --> $DIR/aliasing_mut4.rs:LL:CC
    |
 LL | pub fn safe(_x: &i32, _y: &mut Cell<i32>) {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not granting access to tag <TAG> because incompatible item is protected: [SharedReadOnly for <TAG> (call ID)]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not granting access to tag <TAG> because incompatible item [SharedReadOnly for <TAG>] is protected by call ID
    |
-   = help: this indicates a potential bug in the program: it performed an invalid operation, but the rules it violated are still experimental
+   = help: this indicates a potential bug in the program: it performed an invalid operation, but the Stacked Borrows rules it violated are still experimental
    = help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/stacked-borrows.md for further information
-help: <TAG> was created by a retag at offsets [0x0..0x4]
+help: <TAG> was created by a Unique retag at offsets [0x0..0x4]
   --> $DIR/aliasing_mut4.rs:LL:CC
    |
 LL |     let xref = &mut x;
    |                ^^^^^^
-help: <TAG> was protected due to <TAG> which was created here
-  --> $DIR/aliasing_mut4.rs:LL:CC
-   |
-LL |     safe_raw(xshr, xraw as *mut _);
-   |              ^^^^
-help: this protector is live for this call
+help: <TAG> cannot be used for memory access because that would remove protected tag <TAG>, protected by this function call
   --> $DIR/aliasing_mut4.rs:LL:CC
    |
 LL | pub fn safe(_x: &i32, _y: &mut Cell<i32>) {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+help: <TAG> was derived from <TAG>, which in turn was created here
+  --> $DIR/aliasing_mut4.rs:LL:CC
+   |
+LL |     safe_raw(xshr, xraw as *mut _);
+   |              ^^^^
+   = note: backtrace:
    = note: inside `safe` at $DIR/aliasing_mut4.rs:LL:CC
 note: inside `main` at $DIR/aliasing_mut4.rs:LL:CC
   --> $DIR/aliasing_mut4.rs:LL:CC