Auto merge of #1387 - RalfJung:rustup, r=RalfJung

bump Rust, fix warnings

Author: bors

rust-version

@@ -1 +1 @@
-dae90c195989b09475b6c0225a3018cbd7afa587
+0a675c5e02e6ecfda7d4e04aabd23a9935e0c4bf

src/diagnostics.rs

@@ -48,7 +48,7 @@ pub enum NonHaltingDiagnostic {
 /// Emit a custom diagnostic without going through the miri-engine machinery
 pub fn report_error<'tcx, 'mir>(
     ecx: &InterpCx<'mir, 'tcx, Evaluator<'mir, 'tcx>>,
-    mut e: InterpErrorInfo<'tcx>,
+    e: InterpErrorInfo<'tcx>,
 ) -> Option<i64> {
     use InterpError::*;
 

src/eval.rs

@@ -196,7 +196,7 @@ pub fn eval_main<'tcx>(tcx: TyCtxt<'tcx>, main_id: DefId, config: MiriConfig) ->
 
     let (mut ecx, ret_place) = match create_ecx(tcx, main_id, config) {
         Ok(v) => v,
-        Err(mut err) => {
+        Err(err) => {
             err.print_backtrace();
             panic!("Miri initialization error: {}", err.kind)
         }