syntax_data: {"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // with only stable options if no unstable options are used. Since error-format
context_before:     // We need the `opts_present` check because the driver will send us Matches
context_after:     // is unstable, it will not be present. We have to use `opts_present` not