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


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// Don't allow unstable features in stable functions without `allow_internal_unstable`.

#![stable(feature = "rust1", since = "1.0.0")]

#![feature(staged_api)]
#![feature(const_transmute)]

#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_stable(feature = "rust1", since = "1.0.0")]
pub const fn foo() -> i32 {
    unsafe { std::mem::transmute(4u32) } //~ ERROR `transmute`
}

fn main() {}