src/test/mir-opt/end_region_5.rs

   1 // Copyright 2017 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: -Z identify_regions -Z span_free_formats
  12 // ignore-tidy-linelength
  13
  14 // Unwinding should EndRegion for in-scope borrows: Borrowing via by-ref closure.
  15
  16 fn main() {
  17     let d = D(0);
  18     foo(|| -> i32 { d.0 });
  19 }
  20
  21 struct D(i32);
  22 impl Drop for D { fn drop(&mut self) { println!("dropping D({})", self.0); } }
  23
  24 fn foo<F>(f: F) where F: FnOnce() -> i32 {
  25     if f() > 0 { panic!("im positive"); }
  26 }
  27
  28 // END RUST SOURCE
  29 // START rustc.node4.SimplifyCfg-qualify-consts.after.mir
  30 // fn main() -> () {
  31 //     let mut _0: ();
  32 //     let _1: D;
  33 //     let mut _2: ();
  34 //     let mut _3: ();
  35 //     let mut _4: [closure@NodeId(18) d: &'19mce D];
  36 //     let mut _5: &'19mce D;
  37 //
  38 //     bb0: {
  39 //         StorageLive(_1);
  40 //         _1 = D::{{constructor}}(const 0i32,);
  41 //         StorageLive(_4);
  42 //         StorageLive(_5);
  43 //         _5 = &'19mce _1;
  44 //         _4 = [closure@NodeId(18)] { d: _5 };
  45 //         StorageDead(_5);
  46 //         _3 = const foo(_4) -> [return: bb2, unwind: bb3];
  47 //     }
  48 //     bb1: {
  49 //         resume;
  50 //     }
  51 //     bb2: {
  52 //         StorageDead(_4);
  53 //         EndRegion('19mce);
  54 //         _0 = ();
  55 //         drop(_1) -> bb4;
  56 //     }
  57 //     bb3: {
  58 //         EndRegion('19mce);
  59 //         drop(_1) -> bb1;
  60 //     }
  61 //     bb4: {
  62 //         StorageDead(_1);
  63 //         return;
  64 //     }
  65 // }
  66 // END rustc.node4.SimplifyCfg-qualify-consts.after.mir
  67
  68 // START rustc.node18.SimplifyCfg-qualify-consts.after.mir
  69 // fn main::{{closure}}(_1: [closure@NodeId(18) d:&'19mce D]) -> i32 {
  70 //    let mut _0: i32;
  71 //    let mut _2: i32;
  72 //
  73 //    bb0: {
  74 //        StorageLive(_2);
  75 //        _2 = ((*(_1.0: &'19mce D)).0: i32);
  76 //        _0 = _2;
  77 //        StorageDead(_2);
  78 //        return;
  79 //    }
  80 // END rustc.node18.SimplifyCfg-qualify-consts.after.mir