add regression test for rust-lang#35593

Fixes rust-lang#35593

Author: nikomatsakis

src/test/incremental/issue-35593.rs

@@ -0,0 +1,21 @@
+// Copyright 2016 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.
+
+// Regression test for #35593. Check that we can reuse this trivially
+// equal example.
+
+// revisions:rpass1 rpass2
+
+#![feature(rustc_attrs)]
+#![rustc_partition_reused(module="issue_35593", cfg="rpass2")]
+
+fn main() {
+    println!("hello world");
+}