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error: `extern` block uses type `Foo`, which is not FFI-safe
--> $DIR/issue-16250.rs:6:20
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LL | pub fn foo(x: (Foo));
| ^^^ not FFI-safe
|
note: the lint level is defined here
--> $DIR/issue-16250.rs:1:9
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LL | #![deny(warnings)]
| ^^^^^^^^
= note: `#[deny(improper_ctypes)]` implied by `#[deny(warnings)]`
= help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
= note: this struct has unspecified layout
note: the type is defined here
--> $DIR/issue-16250.rs:3:1
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LL | pub struct Foo;
| ^^^^^^^^^^^^^^
error: aborting due to previous error
|
