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@xxxxxxxxxx>
Link: https://github.com/Rust-for-Linux/pin-init/pull/62/commits/58612514b256c6f4a4a0718be25298410e67387a
[ Also fix a compile error in block. - Benno ]
Signed-off-by: Benno Lossin <lossin@xxxxxxxxxx>
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This patch is also needed by Danilo for initializing `Devres`
ergonomically.