syntax_data: {"ast_node_type":"variable","tokens":[{"end":59,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:             if let Some(prev) = impl_candidate.replace(c) {
context_before:         for c in impls {
context_after:                 if self.prefer_lhs_over_victim(has_non_region_infer, c, prev.0) {