src/test/mir-opt/end_region_4.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 emit-end-regions
  12 // ignore-tidy-linelength
  13
  14 // Unwinding should EndRegion for in-scope borrows: Direct borrows.
  15
  16 fn main() {
  17     let d = D(0);
  18     let a = 0;
  19     let b = &a;
  20     foo(*b);
  21     let c = &a;
  22 }
  23
  24 struct D(i32);
  25 impl Drop for D { fn drop(&mut self) { println!("dropping D({})", self.0); } }
  26
  27 fn foo(i: i32) {
  28     if i > 0 { panic!("im positive"); }
  29 }
  30
  31 // END RUST SOURCE
  32 // START rustc.main.SimplifyCfg-qualify-consts.after.mir
  33 //     let mut _0: ();
  34 //     ...
  35 //     let _1: D;
  36 //     ...
  37 //     let _2: i32;
  38 //     ...
  39 //     let _3: &'26_2rs i32;
  40 //     ...
  41 //     let _6: &'26_4rs i32;
  42 //     ...
  43 //     let mut _4: ();
  44 //     let mut _5: i32;
  45 //     bb0: {
  46 //         StorageLive(_1);
  47 //         _1 = D::{{constructor}}(const 0i32,);
  48 //         StorageLive(_2);
  49 //         _2 = const 0i32;
  50 //         StorageLive(_3);
  51 //         _3 = &'26_2rs _2;
  52 //         StorageLive(_5);
  53 //         _5 = (*_3);
  54 //         _4 = const foo(_5) -> [return: bb1, unwind: bb3];
  55 //     }
  56 //     bb1: {
  57 //         StorageDead(_5);
  58 //         StorageLive(_6);
  59 //         _6 = &'26_4rs _2;
  60 //         _0 = ();
  61 //         EndRegion('26_4rs);
  62 //         StorageDead(_6);
  63 //         EndRegion('26_2rs);
  64 //         StorageDead(_3);
  65 //         StorageDead(_2);
  66 //         drop(_1) -> bb4;
  67 //     }
  68 //     bb2: {
  69 //         resume;
  70 //     }
  71 //     bb3: {
  72 //         EndRegion('26_2rs);
  73 //         drop(_1) -> bb2;
  74 //     }
  75 //     bb4: {
  76 //         StorageDead(_1);
  77 //         return;
  78 //     }
  79 // END rustc.main.SimplifyCfg-qualify-consts.after.mir