1 files changed, 6 insertions, 0 deletions
diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..70e301b
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,6 @@
+fn main() {
+    let ac = autocfg::new();
+    if ac.probe_expression("(0..10).step_by(2).rev()") {
+        autocfg::emit("step_by");
+    }
+}