Auto merge of #1619 - RalfJung:rustup, r=RalfJung

rustup

rust-version

@@ -1 +1 @@
-5cdf5b882da9e8b7c73b5cadeb7745cb68f6ff63
+89631663b7ad2d46d3e4f52bcfa7bee2be9eb82b

src/shims/backtrace.rs

@@ -81,10 +81,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
             throw_unsup_format!("unknown `miri_resolve_frame` flags {}", flags);
         }
 
-        let ptr = match this.read_scalar(ptr)?.check_init()? {
-            Scalar::Ptr(ptr) => ptr,
-            Scalar::Raw { .. } => throw_ub_format!("expected a pointer in `rust_miri_resolve_frame`, found {:?}", ptr)
-        };
+        let ptr = this.force_ptr(this.read_scalar(ptr)?.check_init()?)?;
 
         let fn_instance = if let Some(GlobalAlloc::Function(instance)) = this.tcx.get_global_alloc(ptr.alloc_id) {
             instance

tests/compile-fail/backtrace/bad-backtrace-ptr.rs

@@ -4,6 +4,6 @@ extern "Rust" {
 
 fn main() {
     unsafe {
-        miri_resolve_frame(0 as *mut _, 0); //~ ERROR Undefined Behavior: expected a pointer
+        miri_resolve_frame(0 as *mut _, 0); //~ ERROR 0x0 is not a valid pointer
     }
 }