File: issue-79137-monomorphic.rs

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rustc 1.88.0%2Bdfsg1-1
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//@ check-pass

// Verify that variant count intrinsic can still evaluate for types like `Option<T>`.

#![feature(variant_count)]

pub struct GetVariantCount<T>(T);

impl<T> GetVariantCount<T> {
    pub const VALUE: usize = std::mem::variant_count::<T>();
}

const fn check_variant_count<T>() -> bool {
    matches!(GetVariantCount::<Option<T>>::VALUE, GetVariantCount::<Option<()>>::VALUE)
}

fn main() {
    assert!(check_variant_count::<()>());
}