{"ast_node_type":"variable","tokens":[{"end":86,"kind":"keyword","start":0,"text":"let"}]}
        let layout = self.layout_of(Ty::new_mut_ptr(self.tcx.tcx, mplace.layout.ty))?;
        let imm = mplace.mplace.to_ref(self);
        interp_ok(ImmTy::from_immediate(imm, layout))