syntax_data: {"ast_node_type":"variable","tokens":[{"end":57,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let bit_state = state.contains(peek_mpi);
context_before:             LookupResult::Exact(peek_mpi) => {
context_after:                 debug!("rustc_peek({:?} = &{:?}) bit_state: {}", call.arg, place, bit_state);