add functional feature

2018-12-10 10:12:53 +08:00 · 2018-12-10 10:12:53 +08:00 · 6932e61bc2
parent dcb487b9e7
commit 6932e61bc2
1 changed files with 10 additions and 2 deletions
--- a/e.rs
+++ b/e.rs
@ -1,7 +1,15 @@
-#![feature(main)]
-#[main]
+#[cfg(feature = "functional")]
+fn e() {
+    std::iter::repeat('e').for_each(|e| print!("{}", e))
+}
+
+#[cfg(not(feature = "functional"))]
 fn e() {
    loop {
        print!("e");
    }
 }
+
+fn main() {
+    e();
+}