1 warning: `extern` block uses type `TransparentCustomZst`, which is not FFI-safe
2 --> $DIR/repr-transparent-issue-87496.rs:8:18
4 LL | fn good17(p: TransparentCustomZst);
5 | ^^^^^^^^^^^^^^^^^^^^ not FFI-safe
7 = note: `#[warn(improper_ctypes)]` on by default
8 = note: this struct contains only zero-sized fields
9 note: the type is defined here
10 --> $DIR/repr-transparent-issue-87496.rs:6:1
12 LL | struct TransparentCustomZst(());
13 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
15 warning: 1 warning emitted