{"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"//"}]}
            // it as we do elsewhere in the compiler using `MetadataDecoder::split_at`. But we own
            // `MetadataBlob`. Ideally we'd just have a `MetadataDecoder` and hand out subslices of
            // the data for the decoder so holding onto the `MemDecoder` too would make us a