96 lines
2.6 KiB
Rust
96 lines
2.6 KiB
Rust
// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// compile-flags: -Z identify_regions -Z span_free_formats -Z emit-end-regions
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// ignore-tidy-linelength
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// This test models a scenario that arielb1 found during review.
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// Namely, any filtering of EndRegions must ensure to continue to emit
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// any necessary EndRegions that occur earlier in the source than the
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// first borrow involving that region.
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//
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// It is tricky to actually construct examples of this, which is the
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// main reason that I am keeping this test even though I have now
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// removed the pre-filter that motivated the test in the first place.
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fn main() {
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let mut second_iter = false;
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let x = 3;
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'a: loop {
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let mut y;
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loop {
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if second_iter {
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break 'a; // want to generate `EndRegion('a)` here
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} else {
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y = &/*'a*/ x;
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}
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second_iter = true;
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}
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}
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}
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// END RUST SOURCE
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// START rustc.main.SimplifyCfg-qualify-consts.after.mir
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// fn main() -> () {
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// let mut _0: ();
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// ...
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// let mut _4: &'33_0rs i32;
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// ...
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// let _2: i32;
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// ...
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// let mut _1: bool;
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// ...
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// let mut _3: ();
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// let mut _5: !;
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// let mut _6: ();
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// let mut _7: bool;
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// let mut _8: !;
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// bb0: {
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// StorageLive(_1);
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// _1 = const false;
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// StorageLive(_2);
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// _2 = const 3i32;
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// falseUnwind -> [real: bb2, cleanup: bb1];
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// }
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// bb1: {
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// ...
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// }
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// bb2: {
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// StorageLive(_4);
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// goto -> bb3;
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// }
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// bb3: {
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// falseUnwind -> [real: bb4, cleanup: bb1];
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// }
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// bb4: {
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// StorageLive(_7);
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// _7 = _1;
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// switchInt(move _7) -> [false: bb6, otherwise: bb5];
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// }
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// bb5: {
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// _0 = ();
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// StorageDead(_7);
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// EndRegion('33_0rs);
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// StorageDead(_4);
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// StorageDead(_2);
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// StorageDead(_1);
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// return;
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// }
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// bb6: {
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// _4 = &'33_0rs _2;
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// _6 = ();
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// StorageDead(_7);
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// _1 = const true;
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// _3 = ();
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// goto -> bb3;
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// }
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// }
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// END rustc.main.SimplifyCfg-qualify-consts.after.mir
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