syntax_data: {"ast_node_type":"import","tokens":[{"end":82,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // Choose a match pair from the first candidate, and use it to determine a
context_before:     ) -> BlockAnd<&'b mut [&'c mut Candidate<'tcx>]> {
context_after:         // test to perform that will confirm or refute that match pair.