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error: `extern` fn uses type `Option<&T>`, which is not FFI-safe
--> $DIR/lint-ctypes-option-nonnull-unsized.rs:3:45
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LL | extern "C" fn foo<T: ?Sized + 'static>() -> Option<&'static T> {
| ^^^^^^^^^^^^^^^^^^ not FFI-safe
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= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
= note: enum has no representation hint
note: the lint level is defined here
--> $DIR/lint-ctypes-option-nonnull-unsized.rs:1:9
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LL | #![deny(improper_ctypes_definitions)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 1 previous error
|
