syntax_data: {"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // Form 3: A trait obligation for an associated item failed to be met.
context_before:         ty::PredicateKind::Clause(ty::ClauseKind::Trait(pred)) => {
context_after:             debug!("extended_cause_with_original_assoc_item_obligation trait proj {:?}", pred);