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Report let bindings and statements as unstable
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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT | ||
// file at the top-level directory of this distribution and at | ||
// http://rust-lang.org/COPYRIGHT. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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#![feature(const_let)] | ||
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fn main() {} | ||
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struct FakeNeedsDrop; | ||
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impl Drop for FakeNeedsDrop { | ||
fn drop(&mut self) {} | ||
} | ||
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// ok | ||
const X: FakeNeedsDrop = { let x = FakeNeedsDrop; x }; | ||
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// error | ||
const Y: FakeNeedsDrop = { let mut x = FakeNeedsDrop; x = FakeNeedsDrop; x }; | ||
//~^ ERROR constant contains unimplemented expression type | ||
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// error | ||
const Z: () = { let mut x = None; x = Some(FakeNeedsDrop); }; | ||
//~^ ERROR constant contains unimplemented expression type |
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error[E0019]: constant contains unimplemented expression type | ||
--> $DIR/const_let.rs:25:55 | ||
| | ||
LL | const Y: FakeNeedsDrop = { let mut x = FakeNeedsDrop; x = FakeNeedsDrop; x }; | ||
| ^ | ||
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error[E0019]: constant contains unimplemented expression type | ||
--> $DIR/const_let.rs:29:35 | ||
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LL | const Z: () = { let mut x = None; x = Some(FakeNeedsDrop); }; | ||
| ^ | ||
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error: aborting due to 2 previous errors | ||
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For more information about this error, try `rustc --explain E0019`. |
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