Adjacently tagged enums fail to deserialize

[acanthite1855]

I tried to use serde's adjacently tagged serialization of enums with RON. But it does not seem to work. Unless I've something missing. Here is the example:

use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize)]
#[serde(tag = "type", content = "data")]
enum TestEnum {
    Name(String),
    Index(u32),
}

fn main() {
    use ron::{ser::to_string, de::from_str};

    let source = TestEnum::Index(1);

    let ron_string = to_string(&source).unwrap(); // this one is ok
    let deserialized = from_str::<TestEnum>(&ron_string).unwrap(); // fails here
}

However, the same test for json5 works fine. Am I doing something wrong here?

Here is stack trace:

thread 'main' panicked at 'not implemented: IdDeserializer may only be used for identifiers', <::std::macros::panic macros>:5:6
stack backtrace:
   0: backtrace::backtrace::trace_unsynchronized
             at C:\Users\VssAdministrator\.cargo\registry\src\github.com-1ecc6299db9ec823\backtrace-0.3.40\src\backtrace\mod.rs:66
   1: std::sys_common::backtrace::_print_fmt
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\sys_common\backtrace.rs:77
   2: std::sys_common::backtrace::_print::{{impl}}::fmt
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\sys_common\backtrace.rs:59
   3: core::fmt::write
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libcore\fmt\mod.rs:1052
   4: std::io::Write::write_fmt<std::sys::windows::stdio::Stderr>
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\io\mod.rs:1426
   5: std::sys_common::backtrace::_print
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\sys_common\backtrace.rs:62
   6: std::sys_common::backtrace::print
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\sys_common\backtrace.rs:49
   7: std::panicking::default_hook::{{closure}}
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\panicking.rs:204
   8: std::panicking::default_hook
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\panicking.rs:224
   9: std::panicking::rust_panic_with_hook
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\panicking.rs:472
  10: std::panicking::begin_panic_handler
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\panicking.rs:380
  11: std::panicking::begin_panic_fmt
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\panicking.rs:334
  12: ron::de::id::{{impl}}::deserialize_str<serde::private::de::content::TagContentOtherFieldVisitor>
             at <::std::macros::panic macros>:5
  13: serde::private::de::content::{{impl}}::deserialize<mut ron::de::id::IdDeserializer*>
             at C:\Users\acanthite\.cargo\registry\src\github.com-1ecc6299db9ec823\serde-1.0.105\src\private\de.rs:981
  14: ron::de::{{impl}}::next_key_seed<serde::private::de::content::TagContentOtherFieldVisitor>
             at C:\Users\acanthite\.cargo\registry\src\github.com-1ecc6299db9ec823\ron-0.5.1\src\de\mod.rs:546
  15: tg::_IMPL_DESERIALIZE_FOR_TestEnum::{{impl}}::deserialize::{{impl}}::visit_map<ron::de::CommaSeparated>
             at .\src\main.rs:3
  16: ron::de::{{impl}}::deserialize_struct<tg::_IMPL_DESERIALIZE_FOR_TestEnum::{{impl}}::deserialize::__Visitor>
             at C:\Users\acanthite\.cargo\registry\src\github.com-1ecc6299db9ec823\ron-0.5.1\src\de\mod.rs:450
  17: tg::_IMPL_DESERIALIZE_FOR_TestEnum::{{impl}}::deserialize<mut ron::de::Deserializer*>
             at .\src\main.rs:3
  18: ron::de::from_bytes<tg::TestEnum>
             at C:\Users\acanthite\.cargo\registry\src\github.com-1ecc6299db9ec823\ron-0.5.1\src\de\mod.rs:70
  19: ron::de::from_str<tg::TestEnum>
             at C:\Users\acanthite\.cargo\registry\src\github.com-1ecc6299db9ec823\ron-0.5.1\src\de\mod.rs:60
  20: tg::main
             at .\src\main.rs:16
  21: std::rt::lang_start::{{closure}}<()>
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\src\libstd\rt.rs:67
  22: std::rt::lang_start_internal::{{closure}}
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\rt.rs:52
  23: std::panicking::try::do_call<closure-0,i32>
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\panicking.rs:305
  24: panic_unwind::__rust_maybe_catch_panic
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libpanic_unwind\lib.rs:86
  25: std::panicking::try
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\panicking.rs:281
  26: std::panic::catch_unwind
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\panic.rs:394
  27: std::rt::lang_start_internal
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\/src\libstd\rt.rs:51
  28: std::rt::lang_start<()>
             at /rustc/b8cedc00407a4c56a3bda1ed605c6fc166655447\src\libstd\rt.rs:67
  29: main
  30: invoke_main
             at d:\agent\_work\4\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:78
  31: __scrt_common_main_seh
             at d:\agent\_work\4\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288
  32: BaseThreadInitThunk
  33: RtlUserThreadStart
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.