syntax_data: {"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // path to the crate followed by the path to the item within the crate.
context_before:         // If `def_id` is a direct or injected extern crate, return the
context_after:         if let Some(cnum) = def_id.as_crate_root() {