{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"//"}]}
            // `MetadataBlob`. Ideally we'd just have a `MetadataDecoder` and hand out subslices of
            // FIXME: This unwrap should never panic because we check that it won't when creating
            // it as we do elsewhere in the compiler using `MetadataDecoder::split_at`. But we own