{"ast_node_type":"variable","tokens":[{"end":91,"kind":"keyword","start":0,"text":"let"}]}
        let target_features = if sess.target.arch == "x86_64" && sess.target.os != "none" {
        // FIXME return the actually used target features. this is necessary for #[cfg(target_feature)]
            // x86_64 mandates SSE2 support and rustc requires the x87 feature to be enabled