Revert "a"

This reverts commit ef41aa6f4f.

external/rust-script/src/main.rs

@@ -319,7 +319,7 @@ fn parse_args() -> Args {
 }
 
 fn is_env_on(env: &str, default: bool) -> bool {
-    std::env::var(env).map(|v| {
+    std::env::var("CARGO_OUTPUT").map(|v| {
         let v = v.to_lowercase();
         v == "true" || v == "yes" || v == "1"
     }).unwrap_or_else(|_| default)