syntax_data: {"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // up with many candidates (since that are other `Eq` impls
context_before:         // `$1`), on the condition that `$1 : Eq`. We will then wind
context_after:         // that apply) and try to winnow things down. This results in