Migrations fail if SQL file exists that is commented out

/* Below doesn't work!
DROP TRIGGER IF EXISTS trigger_tbl_stg_option_details_update_time_checked ON tbl_stg_option_details;
CREATE OR REPLACE FUNCTION fx_tbl_stg_option_details_update_time_checked()
RETURNS trigger AS 'BEGIN
UPDATE tbl_stg_option_details
    SET NEW.time_checked = now();
END' LANGUAGE 'plpgsql';

CREATE TRIGGER trigger_tbl_stg_option_details_update_time_checked
  AFTER UPDATE OF return_json
  ON tbl_stg_option_details
  FOR EACH ROW
  EXECUTE PROCEDURE fx_tbl_stg_option_details_update_time_checked();
*/