0.0.124 #128
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0.0.124 #128
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... this has a tendency to cause `reached the recursion limit while auto-dereferencing` errors, and even a dumb struct copy suffices to avoid it.
Because LDK often takes `Deref<Target=Trait>` as type parameters,
we'd implemented `Deref { type Target=Self; .. }` for the traits
defined in the bindings crate. This worked well, but because Rust
auto-`Deref`s, it can lead to spurious compilation failures due to
infinite recursion trying to deref.
In the past we've worked around this by coming up with alternative
compilation strategies when faced with `Deref` recursion, but we
don't strictly need to.
Instead, here, we introduce duplicates of all our `Trait` structs
which become the `Deref` `Target`. This way, we can `Deref` into
the `Trait` and maintain LDK compatibility, without having any
infinite `Deref` recursion issues.
One complication is traits which contain associated types to define
`Deref`s to another associated type, e.g.
trait A {
type B;
type C: Deref<Target = Self::B>;
}
In this case, `B` needs to be the `TraitRef` and `C` needs to be
the `Trait`. We add code specifically to detect this case.
This adds a "same item but as a reference/non-`is_owned`" helper method for our opaque wrapper structs, as well as implements `Deref` on them to the native type. Finally, it implements `Send` and `Sync` on them by blindly assuming it is implemented on the underlying struct.
Single-impl traits which are marked no-export (like `AChannelManager` in LDK) are mapped as the singular implementing type, rather than a full-blown trait. Here we handle this case when writing Rust objects (generally used in writing generic bounds).
Now that we properly handle single-impl traits as Rust types (i.e. in generic parameters), we have to handle "converting" single-impl traits. Here we implement this, diverging from the impl of the underlying impl'd trait by keeping the existing type as-passed and only ref'ing it if required.
Not idea why this was not true originally, but clearly when writing a *reference* conversion, we should be doing so as a *reference*.
`is_clonable` will only work for non-reference types, so this check was actually generally always false.
Not really sure why, but LTO seems to now remove used implementations of `std` causing link failures in downstream languages.
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