mirror of https://github.com/rust-lang/rust
44 lines
926 B
Rust
44 lines
926 B
Rust
//@ run-pass
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type Field1 = (i32, u32);
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type Field2 = f32;
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type Field3 = i64;
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union DummyUnion {
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field1: Field1,
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field2: Field2,
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field3: Field3,
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}
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const FLOAT1_AS_I32: i32 = 1065353216;
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const UNION: DummyUnion = DummyUnion { field1: (FLOAT1_AS_I32, 0) };
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const fn read_field1() -> Field1 {
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const FIELD1: Field1 = unsafe { UNION.field1 };
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FIELD1
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}
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const fn read_field2() -> Field2 {
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const FIELD2: Field2 = unsafe { UNION.field2 };
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FIELD2
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}
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const fn read_field3() -> Field3 {
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const FIELD3: Field3 = unsafe { UNION.field3 };
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FIELD3
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}
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fn main() {
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let foo = FLOAT1_AS_I32;
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assert_eq!(read_field1().0, foo);
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assert_eq!(read_field1().0, FLOAT1_AS_I32);
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let foo = 1.0;
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assert_eq!(read_field2(), foo);
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assert_eq!(read_field2(), 1.0);
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assert_eq!(read_field3(), unsafe { UNION.field3 });
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let foo = unsafe { UNION.field3 };
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assert_eq!(read_field3(), foo);
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}
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