syntax_data: {"ast_node_type":"other","tokens":[{"end":108,"kind":"keyword","start":0,"text":"debug!(?stack.obligation.predicate,"}]}
source_snippet:                 debug!(?stack.obligation.predicate, "found error type in predicate, treating as ambiguous");
context_before:             if stack.obligation.predicate.references_error() {
context_after:                 Ok(None)