Skip to content

reduce needed recursion limit to avoid next-solver FCW #172

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
novacrazy merged 1 commit into from
Aug 7, 2026
+7 −5
Merged

reduce needed recursion limit to avoid next-solver FCW #172

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
12 changes: 7 additions & 5 deletions src/lib.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -396,11 +396,13 @@ impl<T: Copy, U: Copy> Copy for GenericArrayImplOdd<T, U> {}
impl<T, U> Sealed for GenericArrayImplEven<T, U> {}
impl<T, U> Sealed for GenericArrayImplOdd<T, U> {}

// 1 << (size_of::<usize>() << 3) == usize::MAX + 1
type MaxArrayLengthP1 = typenum::Shleft<
typenum::U1,
typenum::Shleft<typenum::U<{ mem::size_of::<usize>() }>, typenum::U3>,
>;
// (256 ^ size_of::<usize>()) == usize::MAX + 1
//
// We've previously used `1 << (size_of::<usize>() << 3)` here. However
// typenum's implementation of `N << M` requires a recursion depth of `log_2(N) + 2M`
// causing uses of this type to hit the default recursion limit of `128`.
type MaxArrayLengthP1 =
<typenum::U256 as typenum::Pow<typenum::U<{ mem::size_of::<usize>() }>>>::Output;

/// Helper trait to hide the complex bound under a simpler name
trait IsWithinUsizeBound: typenum::IsLess<MaxArrayLengthP1, Output = typenum::consts::True> {}
Expand Down
Loading