feat: add rust-script

external/rust-script/tests/data/script-features.rs

@@ -0,0 +1,16 @@
+/*!
+```cargo
+[features]
+dont-panic = []
+```
+*/
+#[cfg(feature="dont-panic")]
+fn main() {
+    println!("--output--");
+    println!("Keep calm and borrow check.");
+}
+
+#[cfg(not(feature="dont-panic"))]
+fn main() {
+    panic!("Do I really exist from an external, non-subjective point of view?");
+}