pub type LLVMOpInfoCallback = Option<extern "C" fn(*mut c_void, u64, u64, u64, i32, *mut c_void) -> i32>;
pub enum LLVMOpInfoCallback { None, Some(extern "C" fn(*mut c_void, u64, u64, u64, i32, *mut c_void) -> i32), }
No value.
Some value of type T.
T