src/test/run-pass-valgrind/cleanup-stdin.rs - toolchain/rustc - Git at Google

 // no-prefer-dynamic

 fn main() {
     let _ = std::io::stdin();
     let _ = std::io::stdout();
     let _ = std::io::stderr();
 }
	// no-prefer-dynamic

	fn main() {
	let _ = std::io::stdin();
	let _ = std::io::stdout();
	let _ = std::io::stderr();
	}