Fix the constant array case as well

Zend/tests/array_literal_next_element_error.phpt

@@ -7,6 +7,9 @@ $i = PHP_INT_MAX;
 $array = [$i => 42, new stdClass];
 var_dump($array);
 
+const FOO = [PHP_INT_MAX => 42, "foo"];
+var_dump(FOO);
+
 ?>
 --EXPECTF--
 Warning: Cannot add element to the array as the next element is already occupied in %s on line %d
@@ -14,3 +17,9 @@ array(1) {
   [%d]=>
   int(42)
 }
+
+Warning: Cannot add element to the array as the next element is already occupied in %s on line %d
+array(1) {
+  [%d]=>
+  int(42)
+}

Zend/zend_compile.c

@@ -5929,7 +5929,7 @@ void zend_do_add_array_element(znode *result, const znode *expr, const znode *of
 }
 /* }}} */
 
-void zend_do_add_static_array_element(zval *result, zval *offset, const zval *expr) /* {{{ */
+void zend_do_add_static_array_element(zval *result, zval *offset, zval *expr) /* {{{ */
 {
 	if (offset) {
 		switch (Z_TYPE_P(offset)) {
@@ -5952,7 +5952,10 @@ void zend_do_add_static_array_element(zval *result, zval *offset, const zval *ex
 				break;
 		}
 	} else {
-		zend_hash_next_index_insert(Z_ARRVAL_P(result), &expr, sizeof(zval *), NULL);
+		if (zend_hash_next_index_insert(Z_ARRVAL_P(result), &expr, sizeof(zval *), NULL) == FAILURE) {
+			zend_error(E_WARNING, "Cannot add element to the array as the next element is already occupied");
+			zval_ptr_dtor(&expr);
+		}
 	}
 }
 /* }}} */

Zend/zend_compile.h

@@ -598,7 +598,7 @@ void zend_do_shell_exec(znode *result, const znode *cmd TSRMLS_DC);
 
 void zend_do_init_array(znode *result, const znode *expr, const znode *offset, zend_bool is_ref TSRMLS_DC);
 void zend_do_add_array_element(znode *result, const znode *expr, const znode *offset, zend_bool is_ref TSRMLS_DC);
-void zend_do_add_static_array_element(zval *result, zval *offset, const zval *expr);
+void zend_do_add_static_array_element(zval *result, zval *offset, zval *expr);
 void zend_do_list_init(TSRMLS_D);
 void zend_do_list_end(znode *result, znode *expr TSRMLS_DC);
 void zend_do_add_list_element(const znode *element TSRMLS_DC);