Euclid fails to build with `default-features = false`

[paxbun]

Euclid 0.22.11 fails to build due to the occurrences of num_traits::real or num_traits::Float when neither std nor libm is enabled.

Reproduction

0. Rust 1.85 is used.

> rustc --version --verbose
rustc 1.85.0 (4d91de4e4 2025-02-17)
binary: rustc
commit-hash: 4d91de4e48198da2e33413efdcd9cd2cc0c46688
commit-date: 2025-02-17
host: aarch64-apple-darwin
release: 1.85.0
LLVM version: 19.1.7

1. Clone euclid.

git clone https://github.com/servo/euclid

2. Checkout to the 0.22.11 commit ed102fa.

git checkout ed102fa314115820ee22d47e587a38ef6c4c7826

3. Build with default features disabled.

cargo build --no-default-features

Result

   Compiling euclid v0.22.11 (/Users/paxbun/Projects/Others/euclid)
error[E0432]: unresolved import `num_traits::real`
  --> src/angle.rs:20:17
   |
20 | use num_traits::real::Real;
   |                 ^^^^ could not find `real` in `num_traits`
   |
note: found an item that was configured out
  --> /Users/paxbun/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/num-traits-0.2.19/src/lib.rs:62:9
   |
62 | pub mod real;
   |         ^^^^
note: the item is gated here
  --> /Users/paxbun/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/num-traits-0.2.19/src/real.rs:1:1
   |
1  | #![cfg(any(feature = "std", feature = "libm"))]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0432]: unresolved import `num_traits::Float`
  --> src/angle.rs:21:18
   |
21 | use num_traits::{Float, FloatConst, NumCast, One, Zero};
   |                  ^^^^^
   |                  |
   |                  no `Float` in the root
   |                  help: a similar name exists in the module (notice the capitalization): `float`
   |
note: found an item that was configured out
  --> /Users/paxbun/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/num-traits-0.2.19/src/lib.rs:32:23
   |
32 | pub use crate::float::Float;
   |                       ^^^^^
note: the item is gated here
  --> /Users/paxbun/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/num-traits-0.2.19/src/lib.rs:31:1
   |
31 | #[cfg(any(feature = "std", feature = "libm"))]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

...

Some errors have detailed explanations: E0432, E0433.
For more information about an error, try `rustc --explain E0432`.
error: could not compile `euclid` (lib) due to 28 previous errors