remove forbidden magic #2 #21
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This "ad-hoc specialization hack using `optin_builtin_traits` and `negative_impls`" was possible to soundness bug in rustc. Flatten probably need `#[feature(specialization)]` to work, though specialization doesn't work with associated items at the moment, so this needs more research.
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This "ad-hoc specialization hack using
optin_builtin_traitsandnegative_impls"was possible due to a soundness bug in rustc. (see rust-lang/rust#74629)
Flatten probably need
#[feature(specialization)]to work, though specializationdoesn't work with associated items at the moment, so this needs more research.