mirror of https://github.com/rust-lang/rust
50 lines
1.2 KiB
Rust
50 lines
1.2 KiB
Rust
//@ run-pass
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#![feature(core_intrinsics)]
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use std::intrinsics::discriminant_value;
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struct Zst;
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struct Struct {
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_a: u32,
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}
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union Union {
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_a: u32,
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}
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fn check(v: u8) {
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assert_eq!(v, 0);
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}
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pub fn generic<T>()
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where
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for<'a> T: Fn(&'a isize),
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{
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let v: Vec<T> = Vec::new();
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let _: u8 = discriminant_value(&v);
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}
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fn main() {
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// check that we use `u8` as the discriminant value
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// for everything that is not an enum.
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check(discriminant_value(&true));
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check(discriminant_value(&'a'));
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check(discriminant_value(&7));
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check(discriminant_value(&7.0));
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check(discriminant_value(&Zst));
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check(discriminant_value(&Struct { _a: 7 }));
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check(discriminant_value(&Union { _a: 7 }));
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check(discriminant_value(&[7, 77]));
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check(discriminant_value(&(7 as *const ())));
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check(discriminant_value(&(7 as *mut ())));
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check(discriminant_value(&&7));
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check(discriminant_value(&&mut 7));
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check(discriminant_value(&check));
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let fn_ptr: fn(u8) = check;
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check(discriminant_value(&fn_ptr));
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let hrtb: for<'a> fn(&'a str) -> &'a str = |x| x;
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check(discriminant_value(&hrtb));
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check(discriminant_value(&(7, 77, 777)));
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}
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