2 #![feature(const_discriminant)]
5 use std::mem::{discriminant, Discriminant};
7 // `discriminant(const_expr)` may get const-propagated.
8 // As we want to check that const-eval is equal to ordinary exection,
9 // we wrap `const_expr` with a function which is not const to prevent this.
11 fn identity<T>(x: T) -> T { x }
19 const TEST_A: Discriminant<Test> = discriminant(&Test::A(5));
20 const TEST_A_OTHER: Discriminant<Test> = discriminant(&Test::A(17));
21 const TEST_B: Discriminant<Test> = discriminant(&Test::B);
30 const TEST_V: Discriminant<SingleVariant> = discriminant(&SingleVariant::V);
33 assert_eq!(TEST_A, TEST_A_OTHER);
34 assert_eq!(TEST_A, discriminant(identity(&Test::A(17))));
35 assert_eq!(TEST_B, discriminant(identity(&Test::B)));
36 assert_ne!(TEST_A, TEST_B);
37 assert_ne!(TEST_B, discriminant(identity(&Test::C { a: 42, b: 7 })));
39 assert_eq!(TEST_V, discriminant(identity(&SingleVariant::V)));