syntax_data: {"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:     if source_trait_ref.def_id() == target_trait_def_id {
context_before: ) -> Vec<ty::PolyTraitRef<'tcx>> {
context_after:         return vec![source_trait_ref]; // Shortcut the most common case.