jscript: Use bytecode for assignment to member expression.

dlls/jscript/compile.c

@@ -373,6 +373,22 @@ static HRESULT compile_assign_expression(compiler_ctx_t *ctx, binary_expression_
             return E_OUTOFMEMORY;
         break;
     }
+    case EXPR_MEMBER: {
+        member_expression_t *member_expr = (member_expression_t*)expr->expression1;
+
+        hres = compile_expression(ctx, member_expr->expression);
+        if(FAILED(hres))
+            return hres;
+
+        /* FIXME: Potential optimization */
+        hres = push_instr_str(ctx, OP_str, member_expr->identifier);
+        if(FAILED(hres))
+            return hres;
+
+        if(push_instr(ctx, OP_memberid) == -1)
+            return E_OUTOFMEMORY;
+        break;
+    }
     default:
         expr->expr.eval = assign_expression_eval;
         return compile_interp_fallback(ctx, &expr->expr);

dlls/jscript/engine.c

@@ -3328,9 +3328,8 @@ HRESULT assign_expression_eval(script_ctx_t *ctx, expression_t *_expr, DWORD fla
     }
 
     if(SUCCEEDED(hres)) {
-        hres = put_value(ctx, &exprval, &rval, ei);
-        if(FAILED(hres))
-            VariantClear(&rval);
+        assert(exprval.type != EXPRVAL_IDREF);
+        return throw_reference_error(ctx, ei, JS_E_ILLEGAL_ASSIGN, NULL);
     }
 
     exprval_release(&exprval);