src/test/ui/union/union-repr-c.stderr

   1 error: `extern` block uses type `W`, which is not FFI-safe
   2   --> $DIR/union-repr-c.rs:15:22
   3    |
   4 LL |     static FOREIGN2: W;
   5    |                      ^ not FFI-safe
   6    |
   7 note: the lint level is defined here
   8   --> $DIR/union-repr-c.rs:2:9
   9    |
  10 LL | #![deny(improper_ctypes)]
  11    |         ^^^^^^^^^^^^^^^
  12    = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this union
  13    = note: this union has unspecified layout
  14 note: the type is defined here
  15   --> $DIR/union-repr-c.rs:9:1
  16    |
  17 LL | / union W {
  18 LL | |     a: u8,
  19 LL | | }
  20    | |_^
  21
  22 error: aborting due to previous error
  23