syntax_data: {"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// about the field you also need definition of the variant to which the field
context_before:     /// or patterns (`S { field }`). The index is often useful by itself, but to learn more
context_after:     /// belongs, but it may not exist if it's a tuple field (`tuple.0`).