pub unsafe extern "C" fn Dart_CopyUTF8EncodingOfString(
str_: Dart_Handle,
utf8_array: *mut u8,
length: isize,
) -> Dart_Handlepub unsafe extern "C" fn Dart_CopyUTF8EncodingOfString(
str_: Dart_Handle,
utf8_array: *mut u8,
length: isize,
) -> Dart_Handle