syntax_data: {"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"ReadGuard::map(incr_comp_session,"}]}
source_snippet:         ReadGuard::map(incr_comp_session, |incr_comp_session| match *incr_comp_session {
context_before:         let incr_comp_session = self.incr_comp_session.borrow();
context_after:             IncrCompSession::NotInitialized => panic!(