misc: add generator

Author: tinycedar

src/main.rs

@@ -1,3 +1,18 @@
+#![feature(generators, generator_trait)]
+
+use std::ops::Generator;
+use std::pin::Pin;
+
 fn main() {
-    println!("Hello World!");
-}
+    let mut generator = || {
+        yield 1;
+        yield 2;
+        yield 3;
+        return 4;
+    };
+
+    for _ in 0..4 {
+        let c = Pin::new(&mut generator).resume(());
+        println!("{:?}", c);
+    }
+}

tests/generator.rs

@@ -0,0 +1,24 @@
+#![feature(generators, generator_trait)]
+
+use std::ops::Generator;
+use std::pin::Pin;
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_generator() {
+        let mut generator = || {
+            println!("2");
+            yield;
+            println!("4");
+        };
+
+        println!("1");
+        Pin::new(&mut generator).resume(());
+        println!("3");
+        Pin::new(&mut generator).resume(());
+        println!("5");
+    }
+}