feat: add rust-script

external/rust-script/examples/hello-without-main.ers

@@ -0,0 +1,3 @@
+#!/usr/bin/env rust-script
+
+println!("hello, rust");

external/rust-script/examples/hello.ers

@@ -0,0 +1,5 @@
+#!/usr/bin/env rust-script
+
+fn main() {
+  println!("hello, rust");
+}

external/rust-script/examples/time-main.ers

@@ -0,0 +1,12 @@
+#!/usr/bin/env rust-script
+//! This is a regular crate doc comment, but it also contains a partial
+//! Cargo manifest.  Note the use of a *fenced* code block, and the
+//! `cargo` "language".
+//!
+//! ```cargo
+//! [dependencies]
+//! time = "0.1.25"
+//! ```
+fn main() {
+    println!("{}", time::now().rfc822z());
+}

external/rust-script/examples/time-without-main.ers

@@ -0,0 +1,13 @@
+#!/usr/bin/env rust-script
+/// This is a regular crate doc comment, but it also contains a partial
+/// Cargo manifest.  Note the use of a *fenced* code block, and the
+/// `cargo` "language".
+///
+/// ```cargo
+/// [dependencies]
+/// time = "0.1.25"
+/// ```
+
+use time::now;
+
+println!("{}", now().rfc822z());