delete this test file: it also appears as

src/rfc-1937-termination-trait/termination-trait-for-result-box-error_ok.rs

src/test/run-pass/termination-trait-for-result-box-error_ok.rs

@@ -1,17 +0,0 @@
-// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-#![feature(termination_trait)]
-
-use std::io::Error;
-
-fn main() -> Result<(), Box<Error>> {
-    Ok(())
-}