tests/ui/consts/issue-79137-monomorphic.rs

   1 // check-pass
   2
   3 // Verify that variant count intrinsic can still evaluate for types like `Option<T>`.
   4
   5 #![feature(variant_count)]
   6
   7 pub struct GetVariantCount<T>(T);
   8
   9 impl<T> GetVariantCount<T> {
  10     pub const VALUE: usize = std::mem::variant_count::<T>();
  11 }
  12
  13 const fn check_variant_count<T>() -> bool {
  14     matches!(GetVariantCount::<Option<T>>::VALUE, GetVariantCount::<Option<()>>::VALUE)
  15 }
  16
  17 fn main() {
  18     assert!(check_variant_count::<()>());
  19 }