syntax_data: {"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: /// definition from. The resulting instantiation will map from `target_node`'s
context_before: /// And `target_node` is the impl/trait we're actually going to get the
context_after: /// generics to `source_impl`'s generics as instantiated by `source_args`.