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error: `extern` block uses type `Foo` which is not FFI-safe: this struct has unspecified layout
--> $DIR/issue-16250.rs:16:20
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LL | pub fn foo(x: (Foo)); //~ ERROR unspecified layout
| ^^^
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note: lint level defined here
--> $DIR/issue-16250.rs:11:9
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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: type defined here
--> $DIR/issue-16250.rs:13:1
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LL | pub struct Foo;
| ^^^^^^^^^^^^^^^
error: aborting due to previous error
|
