Fix breakage due to rust-lang/rust#60913

Author: Michael Wright

clippy_lints/src/lib.rs

@@ -1,6 +1,7 @@
 // error-pattern:cargo-clippy
 
 #![feature(box_syntax)]
+#![feature(box_patterns)]
 #![feature(never_type)]
 #![feature(rustc_private)]
 #![feature(slice_patterns)]

clippy_lints/src/redundant_clone.rs

@@ -132,7 +132,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for RedundantClone {
                 let pred_arg = if_chain! {
                     if let Some((pred_fn_def_id, pred_arg, pred_arg_ty, Some(res))) =
                         is_call_with_ref_arg(cx, mir, &pred_terminator.kind);
-                    if *res == mir::Place::Base(mir::PlaceBase::Local(cloned));
+                    if res.base == mir::PlaceBase::Local(cloned);
                     if match_def_path(cx, pred_fn_def_id, &paths::DEREF_TRAIT_METHOD);
                     if match_type(cx, pred_arg_ty, &paths::PATH_BUF)
                         || match_type(cx, pred_arg_ty, &paths::OS_STRING);
@@ -218,7 +218,7 @@ fn is_call_with_ref_arg<'tcx>(
     if_chain! {
         if let TerminatorKind::Call { func, args, destination, .. } = kind;
         if args.len() == 1;
-        if let mir::Operand::Move(mir::Place::Base(mir::PlaceBase::Local(local))) = &args[0];
+        if let mir::Operand::Move(mir::Place { base: mir::PlaceBase::Local(local), .. }) = &args[0];
         if let ty::FnDef(def_id, _) = func.ty(&*mir, cx.tcx).sty;
         if let (inner_ty, 1) = walk_ptrs_ty_depth(args[0].ty(&*mir, cx.tcx));
         if !is_copy(cx, inner_ty);
@@ -244,7 +244,14 @@ fn find_stmt_assigns_to<'a, 'tcx: 'a>(
     stmts
         .rev()
         .find_map(|stmt| {
-            if let mir::StatementKind::Assign(mir::Place::Base(mir::PlaceBase::Local(local)), v) = &stmt.kind {
+            if let mir::StatementKind::Assign(
+                mir::Place {
+                    base: mir::PlaceBase::Local(local),
+                    ..
+                },
+                v,
+            ) = &stmt.kind
+            {
                 if *local == to {
                     return Some(v);
                 }
@@ -271,28 +278,34 @@ fn find_stmt_assigns_to<'a, 'tcx: 'a>(
 fn base_local_and_movability<'tcx>(
     cx: &LateContext<'_, 'tcx>,
     mir: &mir::Body<'tcx>,
-    mut place: &mir::Place<'tcx>,
+    place: &mir::Place<'tcx>,
 ) -> Option<(mir::Local, CannotMoveOut)> {
-    use rustc::mir::Place::*;
+    use rustc::mir::Place;
     use rustc::mir::PlaceBase;
+    use rustc::mir::PlaceRef;
+    use rustc::mir::Projection;
 
     // Dereference. You cannot move things out from a borrowed value.
     let mut deref = false;
     // Accessing a field of an ADT that has `Drop`. Moving the field out will cause E0509.
     let mut field = false;
 
-    loop {
-        match place {
-            Base(PlaceBase::Local(local)) => return Some((*local, deref || field)),
-            Projection(proj) => {
-                place = &proj.base;
-                deref = deref || matches!(proj.elem, mir::ProjectionElem::Deref);
-                if !field && matches!(proj.elem, mir::ProjectionElem::Field(..)) {
-                    field = has_drop(cx, place.ty(&mir.local_decls, cx.tcx).ty);
-                }
-            },
-            _ => return None,
+    let PlaceRef {
+        base: place_base,
+        mut projection,
+    } = place.as_place_ref();
+    if let PlaceBase::Local(local) = place_base {
+        while let Some(box Projection { base, elem }) = projection {
+            projection = base;
+            deref = matches!(elem, mir::ProjectionElem::Deref);
+            field = !field
+                && matches!(elem, mir::ProjectionElem::Field(..))
+                && has_drop(cx, Place::ty_from(place_base, projection, &mir.local_decls, cx.tcx).ty);
         }
+
+        Some((*local, deref || field))
+    } else {
+        None
     }
 }