interpret: make some large types not Copy

compiler/rustc_const_eval/src/interpret/visitor.rs

@@ -13,7 +13,7 @@ use super::{InterpCx, MPlaceTy, Machine, OpTy, PlaceTy};
 /// A thing that we can project into, and that has a layout.
 /// This wouldn't have to depend on `Machine` but with the current type inference,
 /// that's just more convenient to work with (avoids repeating all the `Machine` bounds).
-pub trait Value<'mir, 'tcx, M: Machine<'mir, 'tcx>>: Copy {
+pub trait Value<'mir, 'tcx, M: Machine<'mir, 'tcx>>: Sized {
     /// Gets this value's layout.
     fn layout(&self) -> TyAndLayout<'tcx>;
 
@@ -54,7 +54,7 @@ pub trait Value<'mir, 'tcx, M: Machine<'mir, 'tcx>>: Copy {
 /// A thing that we can project into given *mutable* access to `ecx`, and that has a layout.
 /// This wouldn't have to depend on `Machine` but with the current type inference,
 /// that's just more convenient to work with (avoids repeating all the `Machine` bounds).
-pub trait ValueMut<'mir, 'tcx, M: Machine<'mir, 'tcx>>: Copy {
+pub trait ValueMut<'mir, 'tcx, M: Machine<'mir, 'tcx>>: Sized {
     /// Gets this value's layout.
     fn layout(&self) -> TyAndLayout<'tcx>;
 
@@ -106,12 +106,12 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> Value<'mir, 'tcx, M> for OpTy<'tc
         &self,
         _ecx: &InterpCx<'mir, 'tcx, M>,
     ) -> InterpResult<'tcx, OpTy<'tcx, M::PointerTag>> {
-        Ok(*self)
+        Ok(self.clone())
     }
 
     #[inline(always)]
     fn from_op(op: &OpTy<'tcx, M::PointerTag>) -> Self {
-        *op
+        op.clone()
     }
 
     #[inline(always)]
@@ -146,7 +146,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValueMut<'mir, 'tcx, M>
         &self,
         _ecx: &InterpCx<'mir, 'tcx, M>,
     ) -> InterpResult<'tcx, OpTy<'tcx, M::PointerTag>> {
-        Ok(*self)
+        Ok(self.clone())
     }
 
     #[inline(always)]
@@ -154,12 +154,12 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValueMut<'mir, 'tcx, M>
         &self,
         _ecx: &mut InterpCx<'mir, 'tcx, M>,
     ) -> InterpResult<'tcx, OpTy<'tcx, M::PointerTag>> {
-        Ok(*self)
+        Ok(self.clone())
     }
 
     #[inline(always)]
     fn from_op(op: &OpTy<'tcx, M::PointerTag>) -> Self {
-        *op
+        op.clone()
     }
 
     #[inline(always)]