55ec104313
Also change the order of the fake read for let and the AscribeUserType, so that we use the better span and message from the fake read in errors.
73 lines
2.4 KiB
Rust
73 lines
2.4 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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// this tests move up progration, which is not yet implemented
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// 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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// Check codegen for assignments (`a = b`) where the left-hand-side is
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// not yet initialized. Assignments tend to be absent in simple code,
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// so subtle breakage in them can leave a quite hard-to-find trail of
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// destruction.
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// ignore-tidy-linelength
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fn main() {
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let nodrop_x = false;
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let nodrop_y;
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// Since boolean does not require drop, this can be a simple
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// assignment:
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nodrop_y = nodrop_x;
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let drop_x : Option<Box<u32>> = None;
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let drop_y;
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// Since the type of `drop_y` has drop, we generate a `replace`
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// terminator:
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drop_y = drop_x;
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}
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// END RUST SOURCE
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// START rustc.main.SimplifyCfg-initial.after.mir
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// bb0: {
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// StorageLive(_1);
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// _1 = const false;
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// FakeRead(ForLet, _1);
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// StorageLive(_2);
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// StorageLive(_3);
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// _3 = _1;
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// _2 = move _3;
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// StorageDead(_3);
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// StorageLive(_4);
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// _4 = std::option::Option<std::boxed::Box<u32>>::None;
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// FakeRead(ForLet, _4);
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// AscribeUserType(_4, o, Canonical { variables: [], value: std::option::Option<std::boxed::Box<u32>> });
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// StorageLive(_5);
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// StorageLive(_6);
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// _6 = move _4;
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// replace(_5 <- move _6) -> [return: bb2, unwind: bb5];
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// }
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// ...
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// bb2: {
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// drop(_6) -> [return: bb6, unwind: bb4];
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// }
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// ...
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// bb5: {
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// drop(_6) -> bb4;
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// }
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// END rustc.main.SimplifyCfg-initial.after.mir
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