Auto merge of #105456 - matthiaskrgr:rollup-yennygf, r=matthiaskrgr

Rollup of 10 pull requests

Successful merges:

 - #104922 (Detect long types in E0308 and write them to disk)
 - #105120 (kmc-solid: `std::sys` code maintenance)
 - #105255 (Make nested RPIT inherit the parent opaque's generics.)
 - #105317 (make retagging work even with 'unstable' places)
 - #105405 (Stop passing -export-dynamic to wasm-ld.)
 - #105408 (Add help for `#![feature(impl_trait_in_fn_trait_return)]`)
 - #105423 (Use `Symbol` for the crate name instead of `String`/`str`)
 - #105433 (CI: add missing line continuation marker)
 - #105434 (Fix warning when libcore is compiled with no_fp_fmt_parse)
 - #105441 (Remove `UnsafetyState`)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

src/borrow_tracker/mod.rs

@@ -11,7 +11,6 @@ use rustc_target::abi::Size;
 
 use crate::*;
 pub mod stacked_borrows;
-use stacked_borrows::diagnostics::RetagCause;
 
 pub type CallId = NonZeroU64;
 
@@ -265,11 +264,19 @@ impl GlobalStateInner {
 
 impl<'mir, 'tcx: 'mir> EvalContextExt<'mir, 'tcx> for crate::MiriInterpCx<'mir, 'tcx> {}
 pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
-    fn retag(&mut self, kind: RetagKind, place: &PlaceTy<'tcx, Provenance>) -> InterpResult<'tcx> {
+    fn retag_ptr_value(&mut self, kind: RetagKind, val: &ImmTy<'tcx, Provenance>) -> InterpResult<'tcx, ImmTy<'tcx, Provenance>> {
         let this = self.eval_context_mut();
         let method = this.machine.borrow_tracker.as_ref().unwrap().borrow().borrow_tracker_method;
         match method {
-            BorrowTrackerMethod::StackedBorrows => this.sb_retag(kind, place),
+            BorrowTrackerMethod::StackedBorrows => this.sb_retag_ptr_value(kind, val),
+        }
+    }
+
+    fn retag_place_contents(&mut self, kind: RetagKind, place: &PlaceTy<'tcx, Provenance>) -> InterpResult<'tcx> {
+        let this = self.eval_context_mut();
+        let method = this.machine.borrow_tracker.as_ref().unwrap().borrow().borrow_tracker_method;
+        match method {
+            BorrowTrackerMethod::StackedBorrows => this.sb_retag_place_contents(kind, place),
         }
     }
 

src/borrow_tracker/stacked_borrows/diagnostics.rs

@@ -459,10 +459,10 @@ impl<'history, 'ecx, 'mir, 'tcx> DiagnosticCx<'history, 'ecx, 'mir, 'tcx> {
             Operation::Dealloc(_) => format!(" due to deallocation"),
             Operation::Access(AccessOp { kind, tag, .. }) =>
                 format!(" due to {kind:?} access for {tag:?}"),
-            Operation::Retag(RetagOp { orig_tag, permission, .. }) => {
+            Operation::Retag(RetagOp { orig_tag, permission, new_tag, .. }) => {
                 let permission = permission
                     .expect("start_grant should set the current permission before popping a tag");
-                format!(" due to {permission:?} retag from {orig_tag:?}")
+                format!(" due to {permission:?} retag from {orig_tag:?} (that retag created {new_tag:?})")
             }
         };