syntax_data: {"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":")"}]}
source_snippet: ) -> Result<Option<Instance<'tcx>>, ErrorGuaranteed> {
context_before:     key: ty::PseudoCanonicalInput<'tcx, (DefId, GenericArgsRef<'tcx>)>,
context_after:     let PseudoCanonicalInput { typing_env, value: (def_id, args) } = key;