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> I don't understand the motivating example. As there is not an `E: Default` bound, what does `(None::)?` even mean. My movitvation is let `try_trait_v2` feature can use with both...
> My lang intuition says that we shouldn't make _any_ more traits `#[fundamental]` -- I'd argue that anything wanting that should instead be done via better coherence features instead. (Like...
It's my fault, Just found document here. https://rust-lang.github.io/rfcs/3058-try-trait-v2.html#compatibility-with-accidental-interconversions-if-needed
Related [WASM UDFs](https://github.com/apache/datafusion/issues/9326)