Function clang_sys::clang_codeCompleteAt

pub unsafe extern fn clang_codeCompleteAt(tu: CXTranslationUnit,
                                          file: *const c_char,
                                          line: c_uint,
                                          column: c_uint,
                                          unsaved: *mut CXUnsavedFile,
                                          n_unsaved: c_uint,
                                          flags: CXCodeComplete_Flags)
                                          -> *mut CXCodeCompleteResults