pub fn parse_from(query: &str, rule_name: &str, filter: bool) -> Result<Tree>Expand description
Parse from a named rule, for tests and for the differential harness.
filter off runs the same walk with the FIRST filter disabled, which is how the harness checks
that the filter is the superset it claims to be: the two modes have to accept the same queries
and build the same trees, and if they ever do not, the filter is wrong and not the grammar.