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error: `extern` block uses type `Qux`, which is not FFI-safe
--> $DIR/lint-ctypes-73251-1.rs:23:21
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LL | fn lint_me() -> <u32 as Foo>::Assoc;
| ^^^^^^^^^^^^^^^^^^^ not FFI-safe
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= note: opaque types have no C equivalent
note: the lint level is defined here
--> $DIR/lint-ctypes-73251-1.rs:2:9
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LL | #![deny(improper_ctypes)]
| ^^^^^^^^^^^^^^^
error: aborting due to 1 previous error
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