syntax_data: {"ast_node_type":"variable","tokens":[{"end":75,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:             if let Some(impl_item_span) = ty_to_impl_span(pred.self_ty()) {
context_before:             debug!("extended_cause_with_original_assoc_item_obligation trait proj {:?}", pred);
context_after:                 cause.span = impl_item_span;