Fails to compile with default-features = false on both std and no-std targets

[mdpatelcsecon]

I'm trying to use this crate in an OS kernel project to allow dynamically loading kernel modules and making function calls across module boundaries which requires a stable ABI, however stabby fails to even build when default-features = false is used. I tested it on a dummy crate using a simple point struct and it works with default-features enabled but not with them set to false.

Is there something I need to do to make stabby work with no-std?

The error messages I get are the following:

   Compiling proc-macro2 v1.0.86
   Compiling unicode-ident v1.0.13
   Compiling libc v0.2.158
   Compiling cfg-if v1.0.0
   Compiling byteorder v1.5.0
   Compiling equivalent v1.0.1
   Compiling hashbrown v0.14.5
   Compiling toml_datetime v0.6.8
   Compiling winnow v0.6.18
   Compiling syn v1.0.109
   Compiling stabby-macros v36.1.1
   Compiling rustversion v1.0.17
   Compiling stabby-abi v36.1.1
   Compiling stabby v36.1.1
   Compiling sha2-const-stable v0.1.0
   Compiling quote v1.0.37
   Compiling indexmap v2.5.0
   Compiling getrandom v0.2.15
   Compiling syn v2.0.77
   Compiling rand_core v0.6.4
   Compiling toml_edit v0.22.21
   Compiling zerocopy-derive v0.7.35
   Compiling zerocopy v0.7.35
   Compiling proc-macro-crate v3.2.0
   Compiling ppv-lite86 v0.2.20
   Compiling rand_chacha v0.3.1
   Compiling rand v0.8.5
error[E0277]: the trait bound `Infallible: Default` is not satisfied
  --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/alloc/collections/arc_btree.rs:13:5
   |
13 |     DefaultAllocator: core::default::Default + IAlloc;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Default` is not implemented for `Infallible`
   |
   = help: see issue #48214
help: add `#![feature(trivial_bounds)]` to the crate attributes to enable
  --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/lib.rs:30:1
   |
30 + #![feature(trivial_bounds)]
   |

error[E0277]: the trait bound `Infallible: Default` is not satisfied
  --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/alloc/collections/arc_btree.rs:17:5
   |
17 |     DefaultAllocator: core::default::Default + IAlloc,
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Default` is not implemented for `Infallible`
   |
   = help: see issue #48214
help: add `#![feature(trivial_bounds)]` to the crate attributes to enable
  --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/lib.rs:30:1
   |
30 + #![feature(trivial_bounds)]
   |

error[E0277]: the trait bound `Infallible: Default` is not satisfied
  --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/alloc/collections/arc_btree.rs:26:5
   |
26 |     DefaultAllocator: core::default::Default + IAlloc,
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Default` is not implemented for `Infallible`
   |
   = help: see issue #48214
help: add `#![feature(trivial_bounds)]` to the crate attributes to enable
  --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/lib.rs:30:1
   |
30 + #![feature(trivial_bounds)]
   |

error[E0277]: the trait bound `Infallible: Default` is not satisfied
   --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/alloc/collections/arc_btree.rs:252:5
    |
252 |     DefaultAllocator: core::default::Default,
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Default` is not implemented for `Infallible`
    |
    = help: see issue #48214
help: add `#![feature(trivial_bounds)]` to the crate attributes to enable
   --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/lib.rs:30:1
    |
30  + #![feature(trivial_bounds)]
    |

error[E0277]: the trait bound `Infallible: istable::IStable` is not satisfied
  --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/alloc/single_or_vec.rs:20:52
   |
20 | pub struct SingleOrVec<T: IStable, Alloc: IAlloc + IStable = DefaultAllocator>
   |                                                    ^^^^^^^ the trait `istable::IStable` is not implemented for `Infallible`
   |
   = help: the following other types implement trait `istable::IStable`:
             &T
             &mut T
             ()
             *const T
             *mut T
             Align1024
             Align128
             Align16384
           and 405 others

error[E0599]: no variant or associated item named `new` found for enum `Infallible` in the current scope
   --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/alloc/collections/arc_btree.rs:200:40
    |
200 |         Self::new_in(DefaultAllocator::new())
    |                                        ^^^ variant or associated item not found in `Infallible`
    |
help: there is a method `ne` with a similar name, but with different arguments
   --> /home/mpatel/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/cmp.rs:261:5
    |
261 |     fn ne(&self, other: &Rhs) -> bool {
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0599]: the method `with_waker` exists for struct `StableWaker<'_>`, but its trait bounds were not satisfied
   --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/future.rs:191:15
    |
120 |     #[crate::stabby]
    |     ---------------- method `with_waker` not found for this struct
...
191 |         waker.with_waker(|waker| {
    |         ------^^^^^^^^^^ method cannot be called on `StableWaker<'_>` due to unsatisfied trait bounds
    |
   ::: /home/mpatel/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/convert/mod.rs:904:1
    |
904 | pub enum Infallible {}
    | ------------------- doesn't satisfy `Infallible: Default`
    |
note: trait bound `Infallible: Default` was not satisfied
   --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/future.rs:127:30
    |
127 |     impl<'a, Alloc: IAlloc + Default> StableWaker<'a, Alloc> {
    |                              ^^^^^^^  ----------------------
    |                              |
    |                              unsatisfied trait bound introduced here

error[E0277]: the trait bound `Infallible: Default` is not satisfied
   --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/future.rs:214:94
    |
214 |             (this.vtable().head.poll.as_ref_unchecked())(this.ptr_mut().as_mut(), cx.waker().into())
    |                                                                                              ^^^^ the trait `Default` is not implemented for `Infallible`, which is required by `&core::task::Waker: Into<_>`
    |
note: required for `StableWaker<'_>` to implement `From<&core::task::Waker>`
   --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/future.rs:165:39
    |
165 |     impl<'a, Alloc: IAlloc + Default> From<&'a Waker> for StableWaker<'a, Alloc> {
    |                              -------  ^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^
    |                              |
    |                              unsatisfied trait bound introduced here
    = note: required for `&core::task::Waker` to implement `Into<StableWaker<'_>>`

error[E0277]: the trait bound `Infallible: Default` is not satisfied
   --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/future.rs:237:28
    |
237 |                 cx.waker().into(),
    |                            ^^^^ the trait `Default` is not implemented for `Infallible`, which is required by `&core::task::Waker: Into<_>`
    |
note: required for `StableWaker<'_>` to implement `From<&core::task::Waker>`
   --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/future.rs:165:39
    |
165 |     impl<'a, Alloc: IAlloc + Default> From<&'a Waker> for StableWaker<'a, Alloc> {
    |                              -------  ^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^
    |                              |
    |                              unsatisfied trait bound introduced here
    = note: required for `&core::task::Waker` to implement `Into<StableWaker<'_>>`

error[E0277]: the trait bound `Infallible: Default` is not satisfied
   --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/future.rs:261:28
    |
261 |                 cx.waker().into(),
    |                            ^^^^ the trait `Default` is not implemented for `Infallible`, which is required by `&core::task::Waker: Into<_>`
    |
note: required for `StableWaker<'_>` to implement `From<&core::task::Waker>`
   --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/future.rs:165:39
    |
165 |     impl<'a, Alloc: IAlloc + Default> From<&'a Waker> for StableWaker<'a, Alloc> {
    |                              -------  ^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^
    |                              |
    |                              unsatisfied trait bound introduced here
    = note: required for `&core::task::Waker` to implement `Into<StableWaker<'_>>`

error[E0277]: the trait bound `Infallible: Default` is not satisfied
   --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/future.rs:287:28
    |
287 |                 cx.waker().into(),
    |                            ^^^^ the trait `Default` is not implemented for `Infallible`, which is required by `&core::task::Waker: Into<_>`
    |
note: required for `StableWaker<'_>` to implement `From<&core::task::Waker>`
   --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/future.rs:165:39
    |
165 |     impl<'a, Alloc: IAlloc + Default> From<&'a Waker> for StableWaker<'a, Alloc> {
    |                              -------  ^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^
    |                              |
    |                              unsatisfied trait bound introduced here
    = note: required for `&core::task::Waker` to implement `Into<StableWaker<'_>>`

error[E0277]: the trait bound `Infallible: Default` is not satisfied
   --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/future.rs:313:28
    |
313 |                 cx.waker().into(),
    |                            ^^^^ the trait `Default` is not implemented for `Infallible`, which is required by `&core::task::Waker: Into<_>`
    |
note: required for `StableWaker<'_>` to implement `From<&core::task::Waker>`
   --> /home/mpatel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stabby-abi-36.1.1/src/future.rs:165:39
    |
165 |     impl<'a, Alloc: IAlloc + Default> From<&'a Waker> for StableWaker<'a, Alloc> {
    |                              -------  ^^^^^^^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^
    |                              |
    |                              unsatisfied trait bound introduced here
    = note: required for `&core::task::Waker` to implement `Into<StableWaker<'_>>`

Some errors have detailed explanations: E0277, E0599.
For more information about an error, try `rustc --explain E0277`.
error: could not compile `stabby-abi` (lib) due to 12 previous errors