src/test/ui/union/union-fields-2.rs

   1 // Copyright 2016 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 union U {
  12     a: u8,
  13     b: u16,
  14 }
  15
  16 fn main() {
  17     let u = U {}; //~ ERROR union expressions should have exactly one field
  18     let u = U { a: 0 }; // OK
  19     let u = U { a: 0, b: 1 }; //~ ERROR union expressions should have exactly one field
  20     let u = U { a: 0, b: 1, c: 2 }; //~ ERROR union expressions should have exactly one field
  21                                     //~^ ERROR union `U` has no field named `c`
  22     let u = U { ..u }; //~ ERROR union expressions should have exactly one field
  23                        //~^ ERROR functional record update syntax requires a struct
  24
  25     let U {} = u; //~ ERROR union patterns should have exactly one field
  26     let U { a } = u; // OK
  27     let U { a, b } = u; //~ ERROR union patterns should have exactly one field
  28     let U { a, b, c } = u; //~ ERROR union patterns should have exactly one field
  29                            //~^ ERROR union `U` does not have a field named `c`
  30     let U { .. } = u; //~ ERROR union patterns should have exactly one field
  31                       //~^ ERROR `..` cannot be used in union patterns
  32     let U { a, .. } = u; //~ ERROR `..` cannot be used in union patterns
  33 }