shifting into vanilla folder, adding async

.gitignore

@@ -1,2 +1,3 @@
-/target
+**/target
 hello.txt
+.idea

async/Cargo.lock

@@ -0,0 +1,244 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "async-rustyplayground"
+version = "0.1.0"
+dependencies = [
+ "futures",
+ "rand",
+]
+
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+ "futures-executor",
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async/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "async-rustyplayground"
+version = "0.1.0"
+authors = ["aj <andrewjpack@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rand = "0.7.3"
+futures = "0.3"

async/src/main.rs

@@ -0,0 +1,48 @@
+// `block_on` blocks the current thread until the provided future has run to
+// completion. Other executors provide more complex behavior, like scheduling
+// multiple futures onto the same thread.
+use futures::{executor::block_on, Future};
+
+async fn async_return() -> u8 { 
+    5
+}
+
+fn bar() -> impl Future<Output = u8> {
+    // This `async` block results in a type that implements
+    // `Future<Output = u8>`.
+    async {
+        let x: u8 = async_return().await;
+        x + 5
+    }
+}
+
+async fn async_thing() { 
+    println!("an async thing");
+}
+
+async fn hello_world() { 
+    println!("hello, world!");
+
+    let f1 = async_thing();
+    let f2 = async_thing();
+
+    futures::join!(f1, f2);
+}
+
+fn main() {
+    let future = hello_world(); // Nothing is printed
+    block_on(future); // `future` is run and "hello, world!" is printed
+}
+
+
+#[cfg(test)]
+// #[warn(unused_imports)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test1() {
+        assert_eq!(2, 1 + 1);
+    }
+
+}