syntax_data: {"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// (since the numerical `ExpnId` value is not considered by the `HashStable`
context_before:     /// - the two `ExpnId`s are not equal, but their `Fingerprint`s are equal
context_after:     /// implementation).