syntax_data: {"ast_node_type":"other","tokens":[{"end":39,"kind":"keyword","start":0,"text":"(_,"}]}
source_snippet:                             (_, _) => {
context_before:                             | (ty::ConstKind::Unevaluated(_), _) => (),
context_after:                                 if let Ok(InferOk { obligations, value: () }) = self