syntax_data: {"ast_node_type":"variable","tokens":[{"end":64,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let incr_comp_session = self.incr_comp_session.borrow();
context_before:     pub fn incr_comp_session_dir(&self) -> MappedReadGuard<'_, PathBuf> {
context_after:         ReadGuard::map(incr_comp_session, |incr_comp_session| match *incr_comp_session {