syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// the value of `x` has no particular relevance to this candidate. In
context_before:     /// match arm we have `Foo { x: _, ... }`... in that case, the test for
context_after:     /// such cases, this function just returns None without doing anything.