take RHS by value

Author: Jorge Aparicio

src/libcore/ops.rs

@@ -885,79 +885,79 @@ shr_impl_all! { u8 u16 u32 u64 usize i8 i16 i32 i64 isize }
 #[lang = "add_assign"]
 pub trait AddAssign<Rhs=Self> {
     /// `+=`
-    fn add_assign(&mut self, &Rhs);
+    fn add_assign(&mut self, Rhs);
 }
 
 #[cfg(not(stage0))]
 /// `&=`
 #[lang = "bitand_assign"]
 pub trait BitAndAssign<Rhs=Self> {
     /// `&=`
-    fn bitand_assign(&mut self, &Rhs);
+    fn bitand_assign(&mut self, Rhs);
 }
 
 #[cfg(not(stage0))]
 /// `|=`
 #[lang = "bitor_assign"]
 pub trait BitOrAssign<Rhs=Self> {
     /// `|=`
-    fn bitor_assign(&mut self, &Rhs);
+    fn bitor_assign(&mut self, Rhs);
 }
 
 #[cfg(not(stage0))]
 /// `^=`
 #[lang = "bitxor_assign"]
 pub trait BitXorAssign<Rhs=Self> {
     /// `^=`
-    fn bitxor_assign(&mut self, &Rhs);
+    fn bitxor_assign(&mut self, Rhs);
 }
 
 #[cfg(not(stage0))]
 /// `/=`
 #[lang = "div_assign"]
 pub trait DivAssign<Rhs=Self> {
     /// `/=`
-    fn div_assign(&mut self, &Rhs);
+    fn div_assign(&mut self, Rhs);
 }
 
 #[cfg(not(stage0))]
 /// `*=`
 #[lang = "mul_assign"]
 pub trait MulAssign<Rhs=Self> {
     /// `*=`
-    fn mul_assign(&mut self, &Rhs);
+    fn mul_assign(&mut self, Rhs);
 }
 
 #[cfg(not(stage0))]
 /// `%=`
 #[lang = "rem_assign"]
 pub trait RemAssign<Rhs=Self> {
     /// `%=`
-    fn rem_assign(&mut self, &Rhs);
+    fn rem_assign(&mut self, Rhs);
 }
 
 #[cfg(not(stage0))]
 /// `<<=`
 #[lang = "shl_assign"]
 pub trait ShlAssign<Rhs> {
     /// `<<=`
-    fn shl_assign(&mut self, &Rhs);
+    fn shl_assign(&mut self, Rhs);
 }
 
 #[cfg(not(stage0))]
 /// `>>=`
 #[lang = "shr_assign"]
 pub trait ShrAssign<Rhs> {
     /// `>>=`
-    fn shr_assign(&mut self, &Rhs);
+    fn shr_assign(&mut self, Rhs);
 }
 
 #[cfg(not(stage0))]
 /// `-=`
 #[lang = "sub_assign"]
 pub trait SubAssign<Rhs=Self> {
     /// `-=`
-    fn sub_assign(&mut self, &Rhs);
+    fn sub_assign(&mut self, Rhs);
 }
 
 /// The `Index` trait is used to specify the functionality of indexing operations

src/librustc/middle/expr_use_visitor.rs

@@ -585,14 +585,7 @@ impl<'d,'t,'tcx,TYPER:mc::Typer<'tcx>> ExprUseVisitor<'d,'t,'tcx,TYPER> {
 
             ast::ExprAssignOp(_, ref lhs, ref rhs) => {
                 self.mutate_expr(expr, &**lhs, WriteAndRead);
-
-                if self.typer.is_method_call(expr.id) {
-                    let r = ty::ReScope(region::CodeExtent::from_node_id(expr.id));
-                    self.borrow_expr(rhs, r, ty::ImmBorrow, OverloadedOperator);
-                } else {
-                    // built-in assignment operations consume the RHS
-                    self.consume_expr(&**rhs);
-                }
+                self.consume_expr(&**rhs);
             }
 
             ast::ExprRepeat(ref base, ref count) => {

src/librustc_trans/trans/expr.rs

@@ -1048,7 +1048,7 @@ fn trans_rvalue_stmt_unadjusted<'blk, 'tcx>(bcx: Block<'blk, 'tcx>,
                 let src_datum = unpack_datum!(bcx, trans(bcx, &**src));
                 trans_overloaded_op(bcx, expr, MethodCall::expr(expr.id), dst,
                                     vec![(src_datum, src.id)], None,
-                                    true).bcx
+                                    false).bcx
             }
         }
         ast::ExprInlineAsm(ref a) => {

src/librustc_typeck/check/mod.rs

@@ -3087,7 +3087,7 @@ fn check_expr_with_unifier<'a, 'tcx, F>(fcx: &FnCtxt<'a, 'tcx>,
                         ast_util::binop_to_string(op.node),
                         actual)
             }, lhs_resolved_t, None)
-        }, AutorefArgs::Yes)
+        }, AutorefArgs::No)
     }
 
     fn check_user_unop<'a, 'tcx>(fcx: &FnCtxt<'a, 'tcx>,

src/test/compile-fail/feature-gate-op-assign.rs

@@ -13,7 +13,7 @@ use std::ops::AddAssign;
 struct MyInt(i32);
 
 impl AddAssign for MyInt {
-    fn add_assign(&mut self, rhs: &MyInt) {
+    fn add_assign(&mut self, rhs: MyInt) {
         self.0 += rhs.0
     }
 }

src/test/compile-fail/op-assign-borrow.rs src/test/compile-fail/op-assign-move.rs

@@ -15,16 +15,16 @@ use std::ops::AddAssign;
 struct Int(i32);
 
 impl AddAssign for Int {
-    fn add_assign(&mut self, rhs: &Int) {
+    fn add_assign(&mut self, rhs: Int) {
         self.0 += rhs.0
     }
 }
 
 fn main() {
     let mut x = Int(1);
-    x  //~ error: cannot borrow `x` as mutable because it is also borrowed as immutable
+    x  //~ error: use of moved value: `x`
     +=
-    x;  //~ note: previous borrow of `x` occurs here
+    x;  //~ note: `x` moved here because it has type `Int`, which is non-copyable
 
     let y = Int(2);
     y  //~ error: cannot borrow immutable local variable `y` as mutable

src/test/run-pass/op-assign.rs

@@ -65,73 +65,73 @@ fn main() {
 }
 
 impl AddAssign for Int {
-    fn add_assign(&mut self, rhs: &Int) {
+    fn add_assign(&mut self, rhs: Int) {
         self.0 += rhs.0;
     }
 }
 
 impl BitAndAssign for Int {
-    fn bitand_assign(&mut self, rhs: &Int) {
+    fn bitand_assign(&mut self, rhs: Int) {
         self.0 &= rhs.0;
     }
 }
 
 impl BitOrAssign for Int {
-    fn bitor_assign(&mut self, rhs: &Int) {
+    fn bitor_assign(&mut self, rhs: Int) {
         self.0 |= rhs.0;
     }
 }
 
 impl BitXorAssign for Int {
-    fn bitxor_assign(&mut self, rhs: &Int) {
+    fn bitxor_assign(&mut self, rhs: Int) {
         self.0 ^= rhs.0;
     }
 }
 
 impl DivAssign for Int {
-    fn div_assign(&mut self, rhs: &Int) {
+    fn div_assign(&mut self, rhs: Int) {
         self.0 /= rhs.0;
     }
 }
 
 impl MulAssign for Int {
-    fn mul_assign(&mut self, rhs: &Int) {
+    fn mul_assign(&mut self, rhs: Int) {
         self.0 *= rhs.0;
     }
 }
 
 impl RemAssign for Int {
-    fn rem_assign(&mut self, rhs: &Int) {
+    fn rem_assign(&mut self, rhs: Int) {
         self.0 %= rhs.0;
     }
 }
 
 impl ShlAssign<u8> for Int {
-    fn shl_assign(&mut self, &rhs: &u8) {
+    fn shl_assign(&mut self, rhs: u8) {
         self.0 <<= rhs;
     }
 }
 
 impl ShlAssign<u16> for Int {
-    fn shl_assign(&mut self, &rhs: &u16) {
+    fn shl_assign(&mut self, rhs: u16) {
         self.0 <<= rhs;
     }
 }
 
 impl ShrAssign<u8> for Int {
-    fn shr_assign(&mut self, &rhs: &u8) {
+    fn shr_assign(&mut self, rhs: u8) {
         self.0 >>= rhs;
     }
 }
 
 impl ShrAssign<u16> for Int {
-    fn shr_assign(&mut self, &rhs: &u16) {
+    fn shr_assign(&mut self, rhs: u16) {
         self.0 >>= rhs;
     }
 }
 
 impl SubAssign for Int {
-    fn sub_assign(&mut self, rhs: &Int) {
+    fn sub_assign(&mut self, rhs: Int) {
         self.0 -= rhs.0;
     }
 }