src/test/codegen/mir_zst_stores.rs

   1 // Copyright 2016 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // compile-flags: -C no-prepopulate-passes
  12
  13 #![crate_type = "lib"]
  14 use std::marker::PhantomData;
  15
  16 #[derive(Copy, Clone)]
  17 struct Zst { phantom: PhantomData<Zst> }
  18
  19 // CHECK-LABEL: @mir
  20 // CHECK-NOT: store{{.*}}undef
  21 #[no_mangle]
  22 pub fn mir() {
  23     let x = Zst { phantom: PhantomData };
  24     let y = (x, 0);
  25     drop(y);
  26     drop((0, x));
  27 }