src/test/ui/internal/internal-unstable-const.rs

   1 // Don't allow unstable features in stable functions without `allow_internal_unstable`.
   2
   3 #![stable(feature = "rust1", since = "1.0.0")]
   4 #![feature(staged_api)]
   5 #![feature(const_fn_floating_point_arithmetic)]
   6
   7 #[stable(feature = "rust1", since = "1.0.0")]
   8 #[rustc_const_stable(feature = "rust1", since = "1.0.0")]
   9 pub const fn foo() -> f32 {
  10     1.0 + 1.0 //~ ERROR const-stable function cannot use `#[feature(const_fn_floating_point_arithmetic)]`
  11 }
  12
  13 fn main() {}