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https://github.com/rust-lang/rust
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f3b7dd6388
Only use it when the type alias contains an opaque type. Also does wf-checking on such type aliases.
16 lines
272 B
Rust
16 lines
272 B
Rust
#![feature(type_alias_impl_trait)]
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#![deny(improper_ctypes)]
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type A = impl Fn();
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pub(crate) fn ret_closure() -> A {
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|| {}
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}
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extern "C" {
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pub(crate) fn a(_: A);
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//~^ ERROR `extern` block uses type `A`, which is not FFI-safe [improper_ctypes]
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}
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fn main() {}
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