error[E0617]: can't pass `f32` to variadic function
  --> $DIR/E0617.rs:7:36
   |
LL |         printf(::std::ptr::null(), 0f32);
   |                                    ^^^^
   |
help: cast the value to `c_double`
   |
LL |         printf(::std::ptr::null(), 0f32 as c_double);
   |                                         +++++++++++

error[E0617]: can't pass `i8` to variadic function
  --> $DIR/E0617.rs:10:36
   |
LL |         printf(::std::ptr::null(), 0i8);
   |                                    ^^^
   |
help: cast the value to `c_int`
   |
LL |         printf(::std::ptr::null(), 0i8 as c_int);
   |                                        ++++++++

error[E0617]: can't pass `i16` to variadic function
  --> $DIR/E0617.rs:13:36
   |
LL |         printf(::std::ptr::null(), 0i16);
   |                                    ^^^^
   |
help: cast the value to `c_int`
   |
LL |         printf(::std::ptr::null(), 0i16 as c_int);
   |                                         ++++++++

error[E0617]: can't pass `u8` to variadic function
  --> $DIR/E0617.rs:16:36
   |
LL |         printf(::std::ptr::null(), 0u8);
   |                                    ^^^
   |
help: cast the value to `c_uint`
   |
LL |         printf(::std::ptr::null(), 0u8 as c_uint);
   |                                        +++++++++

error[E0617]: can't pass `u16` to variadic function
  --> $DIR/E0617.rs:19:36
   |
LL |         printf(::std::ptr::null(), 0u16);
   |                                    ^^^^
   |
help: cast the value to `c_uint`
   |
LL |         printf(::std::ptr::null(), 0u16 as c_uint);
   |                                         +++++++++

error[E0617]: can't pass a function item to a variadic function
  --> $DIR/E0617.rs:22:36
   |
LL |         printf(::std::ptr::null(), printf);
   |                                    ^^^^^^
   |
   = help: a function item is zero-sized and needs to be cast into a function pointer to be used in FFI
   = note: for more information on function items, visit https://doc.rust-lang.org/reference/types/function-item.html
help: use a function pointer instead
   |
LL |         printf(::std::ptr::null(), printf as unsafe extern "C" fn(*const i8, ...));
   |                                           +++++++++++++++++++++++++++++++++++++++

error: aborting due to 6 previous errors

For more information about this error, try `rustc --explain E0617`.