35 lines
1.5 KiB
Rust
35 lines
1.5 KiB
Rust
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// Copyright 2016 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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#![feature(untagged_unions)]
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union U {
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a: u8,
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b: u16,
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}
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fn main() {
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let u = U {}; //~ ERROR union expressions should have exactly one field
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let u = U { a: 0 }; // OK
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let u = U { a: 0, b: 1 }; //~ ERROR union expressions should have exactly one field
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let u = U { a: 0, b: 1, c: 2 }; //~ ERROR union expressions should have exactly one field
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//~^ ERROR union `U` has no field named `c`
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let u = U { ..u }; //~ ERROR union expressions should have exactly one field
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//~^ ERROR functional record update syntax requires a struct
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let U {} = u; //~ ERROR union patterns without `..` should have at least one field
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let U { a } = u; // OK
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let U { a, b } = u; //~ ERROR union patterns can have at most one field
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let U { a, b, c } = u; //~ ERROR union patterns can have at most one field
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//~^ ERROR union `U` does not have a field named `c`
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let U { .. } = u; // OK
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let U { a, .. } = u; // OK
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}
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