Fix cases of conflicting two-phase borrows

Author: matthewjasper

src/librustc_codegen_llvm/abi.rs

@@ -266,7 +266,8 @@ impl ArgTypeExt<'ll, 'tcx> for ArgType<'tcx, Ty<'tcx>> {
                 OperandValue::Ref(next(), Some(next()), self.layout.align.abi).store(bx, dst);
             }
             PassMode::Direct(_) | PassMode::Indirect(_, None) | PassMode::Cast(_) => {
-                self.store(bx, next(), dst);
+                let next_arg = next();
+                self.store(bx, next_arg, dst);
             }
         }
     }

src/librustc_mir/transform/add_retag.rs

@@ -164,7 +164,7 @@ impl MirPass for AddRetag {
                         if src_ty.is_region_ptr() {
                             // The only `Misc` casts on references are those creating raw pointers.
                             assert!(dest_ty.is_unsafe_ptr());
-                            (RetagKind::Raw, place)
+                            (RetagKind::Raw, place.clone())
                         } else {
                             // Some other cast, no retag
                             continue
@@ -182,7 +182,7 @@ impl MirPass for AddRetag {
                             _ =>
                                 RetagKind::Default,
                         };
-                        (kind, place)
+                        (kind, place.clone())
                     }
                     // Do nothing for the rest
                     _ => continue,
@@ -191,7 +191,7 @@ impl MirPass for AddRetag {
                 let source_info = block_data.statements[i].source_info;
                 block_data.statements.insert(i+1, Statement {
                     source_info,
-                    kind: StatementKind::Retag(retag_kind, place.clone()),
+                    kind: StatementKind::Retag(retag_kind, place),
                 });
             }
         }

src/libsyntax_ext/format.rs

@@ -347,9 +347,9 @@ impl<'a, 'b> Context<'a, 'b> {
 
             Named(name) => {
                 match self.names.get(&name) {
-                    Some(idx) => {
+                    Some(&idx) => {
                         // Treat as positional arg.
-                        self.verify_arg_type(Exact(*idx), ty)
+                        self.verify_arg_type(Exact(idx), ty)
                     }
                     None => {
                         let msg = format!("there is no argument named `{}`", name);