File: lint-ctypes-66202.rs

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//@ check-pass

#![deny(improper_ctypes)]

// This test checks that return types are normalized before being checked for FFI-safety, and that
// transparent newtype wrappers are FFI-safe if the type being wrapped is FFI-safe.

#[repr(transparent)]
pub struct W<T>(T);

extern "C" {
    pub fn bare() -> ();
    pub fn normalize() -> <() as ToOwned>::Owned;
    pub fn transparent() -> W<()>;
}

fn main() {}