040000 tree 9efc3ad4a3331eda32e073a4137dbbff57f58d0e	by_constant
040000 tree 117c49bf78bd1a95661d3eb22b8011f57a5a6ce2	by_expression
040000 tree 3e5916339e49fc25b6d0165b005495c8a6fc38b4	by_identifier