syntax_data: {"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":")"}]}
source_snippet: ) -> Result<Option<ty::EarlyBinder<'tcx, ty::Const<'tcx>>>, ErrorGuaranteed> {
context_before:     def: LocalDefId,
context_after:     if !tcx.features().generic_const_exprs() {