syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"incremental:"}]}
source_snippet:         incremental: Option<PathBuf> [UNTRACKED],
context_before:         /// directory to store intermediate results.
context_after:         assert_incr_state: Option<IncrementalStateAssertion> [UNTRACKED],