syntax_data: {"ast_node_type":"function","tokens":[{"end":37,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:             if eval.from_dfn >= dfn {
context_before:         self.map.borrow_mut().retain(|fresh_trait_pred, eval| {
context_after:                 debug!(?fresh_trait_pred, ?eval, "on_completion");