feat: add rust-script

external/rust-script/tests/data/templates/shout.rs

@@ -0,0 +1,11 @@
+#{prelude}
+
+fn main() {
+    match {#{script}} {
+        script_result => {
+            let text = script_result.to_string();
+            let text = text.to_uppercase();
+            println!("{}", text);
+        }
+    }
+}