syntax_data: {"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // users may find it useful. Currently, we omit the parent if
context_before:         // Logically, since impls are global, it's never needed, but
context_after:         // the impl is either in the same module as the self-type or