wp-includes/class-wp-error.php:170Verifies if the instance contains errors.
bool public function has_errors() { return (bool) $this->errors; }Introduced in 5.1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-error.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.