clippy

Author: RalfJung

src/tools/miri/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")