{"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"if"}]}
        if let Message::CompilerArtifact(artifact) = message.unwrap() {
    for message in Message::parse_stream(output.stdout.as_slice()) {
            if artifact.target.kind.contains(&cargo_metadata::TargetKind::ProcMacro)