syntax_data: {"ast_node_type":"other","tokens":[{"end":42,"kind":"keyword","start":0,"text":"1"}]}
source_snippet:             1 => TargetTuple::TargetJson {
context_before:             0 => TargetTuple::TargetTuple(d.read_str().to_owned()),
context_after:                 path_for_rustdoc: PathBuf::new(),