syntax_data: {"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                     // Ok, keep `prev` instead of the new entry
context_before:                 } else if self.prefer_lhs_over_victim(has_non_region_infer, prev, c.0) {
context_after:                     impl_candidate = Some(prev);