syntax_data: {"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// that have identical `ExpnData`s. This violates the contract of `HashStable`
context_before:     /// Due to macro expansion, it's possible to end up with two `ExpnId`s
context_after:     /// - the two `ExpnId`s are not equal, but their `Fingerprint`s are equal