fix clippy lints

Author: RalfJung

src/tools/miri/src/concurrency/thread.rs

@@ -890,7 +890,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
             instance,
             start_abi,
             &[*func_arg],
-            Some(&ret_place.into()),
+            Some(&ret_place),
             StackPopCleanup::Root { cleanup: true },
         )?;
 

src/tools/miri/src/eval.rs

@@ -391,7 +391,7 @@ pub fn create_ecx<'mir, 'tcx: 'mir>(
                     argv,
                     Scalar::from_u8(sigpipe).into(),
                 ],
-                Some(&ret_place.into()),
+                Some(&ret_place),
                 StackPopCleanup::Root { cleanup: true },
             )?;
         }
@@ -400,7 +400,7 @@ pub fn create_ecx<'mir, 'tcx: 'mir>(
                 entry_instance,
                 Abi::Rust,
                 &[argc.into(), argv],
-                Some(&ret_place.into()),
+                Some(&ret_place),
                 StackPopCleanup::Root { cleanup: true },
             )?;
         }

src/tools/miri/src/helpers.rs

@@ -401,7 +401,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
         let mir = this.load_mir(f.def, None)?;
         let dest = match dest {
             Some(dest) => dest.clone(),
-            None => MPlaceTy::fake_alloc_zst(this.layout_of(mir.return_ty())?).into(),
+            None => MPlaceTy::fake_alloc_zst(this.layout_of(mir.return_ty())?),
         };
         this.push_stack_frame(f, mir, &dest, stack_pop)?;
 

src/tools/miri/src/shims/windows/sync.rs

@@ -179,7 +179,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
 
         let id = this.init_once_get_id(init_once_op)?;
         let flags = this.read_scalar(flags_op)?.to_u32()?;
-        let pending_place = this.deref_pointer(pending_op)?.into();
+        let pending_place = this.deref_pointer(pending_op)?;
         let context = this.read_pointer(context_op)?;
 
         if flags != 0 {