syntax_data: {"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:             if !leaf_def.item.defaultness(tcx).has_value() {
context_before:             // Any final impl is required to define all associated items.
context_after:                 let guar = tcx.dcx().span_delayed_bug(