error: only foreign or `unsafe extern "C" functions may be C-variadic
  --> $DIR/variadic-ffi-semantic-restrictions.rs:5:17
   |
LL | fn f1(x: isize, ...) {}
   |                 ^^^^

error: only foreign or `unsafe extern "C" functions may be C-variadic
  --> $DIR/variadic-ffi-semantic-restrictions.rs:8:28
   |
LL | extern "C" fn f2(x: isize, ...) {}
   |                            ^^^^

error: only foreign or `unsafe extern "C" functions may be C-variadic
  --> $DIR/variadic-ffi-semantic-restrictions.rs:11:24
   |
LL | extern fn f3(x: isize, ...) {}
   |                        ^^^^

error: only foreign or `unsafe extern "C" functions may be C-variadic
  --> $DIR/variadic-ffi-semantic-restrictions.rs:17:21
   |
LL |     fn f4(x: isize, ...) {}
   |                     ^^^^

error: only foreign or `unsafe extern "C" functions may be C-variadic
  --> $DIR/variadic-ffi-semantic-restrictions.rs:22:21
   |
LL |     fn f5(x: isize, ...) {}
   |                     ^^^^

error: only foreign or `unsafe extern "C" functions may be C-variadic
  --> $DIR/variadic-ffi-semantic-restrictions.rs:24:21
   |
LL |     fn f6(x: isize, ...);
   |                     ^^^^

error: aborting due to 6 previous errors