syntax_data: {"ast_node_type":"other","tokens":[{"end":25,"kind":"keyword","start":0,"text":"match"}]}
source_snippet:     match opt_assertion {
context_before: ) -> Option<IncrementalStateAssertion> {
context_after:         Some(s) if s.as_str() == "loaded" => Some(IncrementalStateAssertion::Loaded),