syntax_data: {"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"self.confirm_trait_upcasting_unsize_candidate(obligation,"}]}
source_snippet:                 self.confirm_trait_upcasting_unsize_candidate(obligation, idx)?
context_before:             TraitUpcastingUnsizeCandidate(idx) => {
context_after:             }