error[E0617]: can't pass `f32` to variadic function
  --> $DIR/E0617.rs:9:36
   |
LL |         printf(::std::ptr::null(), 0f32);
   |                                    ^^^^ help: cast the value to `c_double`: `0f32 as c_double`

error[E0617]: can't pass `i8` to variadic function
  --> $DIR/E0617.rs:12:36
   |
LL |         printf(::std::ptr::null(), 0i8);
   |                                    ^^^ help: cast the value to `c_int`: `0i8 as c_int`

error[E0617]: can't pass `i16` to variadic function
  --> $DIR/E0617.rs:15:36
   |
LL |         printf(::std::ptr::null(), 0i16);
   |                                    ^^^^ help: cast the value to `c_int`: `0i16 as c_int`

error[E0617]: can't pass `u8` to variadic function
  --> $DIR/E0617.rs:18:36
   |
LL |         printf(::std::ptr::null(), 0u8);
   |                                    ^^^ help: cast the value to `c_uint`: `0u8 as c_uint`

error[E0617]: can't pass `u16` to variadic function
  --> $DIR/E0617.rs:21:36
   |
LL |         printf(::std::ptr::null(), 0u16);
   |                                    ^^^^ help: cast the value to `c_uint`: `0u16 as c_uint`

error[E0617]: can't pass `for<'r> unsafe extern "C" fn(*const i8, std::ffi::VaListImpl<'r>, ...) {printf}` to variadic function
  --> $DIR/E0617.rs:24:36
   |
LL |         printf(::std::ptr::null(), printf);
   |                                    ^^^^^^
help: cast the value to `for<'r> unsafe extern "C" fn(*const i8, std::ffi::VaListImpl<'r>, ...)`
   |
LL |         printf(::std::ptr::null(), printf as for<'r> unsafe extern "C" fn(*const i8, std::ffi::VaListImpl<'r>, ...));
   |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 6 previous errors

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