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e832374cca
Remove the error from the blanket implementations `impl<T, E> Init<T, E>
for T` (and also for `PinInit`). Add implementations for `Result<T, E>`.
This allows one to easily construct (un)conditional failing
initializers. It also improves the compatibility with APIs that do not
use pin-init, because users can supply a `Result<T, E>` to a function
taking an `impl PinInit<T, E>`.
Suggested-by: Alice Ryhl <aliceryhl@google.com>
Link: 58612514b2
[ Also fix a compile error in block. - Benno ]
Reviewed-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://lore.kernel.org/all/20250529081027.297648-2-lossin@kernel.org
[ Add title prefix `rust: pin-init`. - Benno ]
Signed-off-by: Benno Lossin <lossin@kernel.org>