Auto merge of #3133 - rust-lang:rustup-2023-10-22, r=RalfJung

Automatic Rustup

Author: bors

rust-version

@@ -1 +1 @@
-249624b5043013d18c00f0401ca431c1a6baa8cd
+9e3f784eb2c7c847b6c3578b373c0e0bc9233ca3

src/shims/backtrace.rs

@@ -37,7 +37,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
         let this = self.eval_context_mut();
         let tcx = this.tcx;
 
-        let flags = if let Some(flags_op) = args.get(0) {
+        let flags = if let Some(flags_op) = args.first() {
             this.read_scalar(flags_op)?.to_u64()?
         } else {
             throw_ub_format!("expected at least 1 argument")