cleanup: reduce arithmetic module visibility

Author: tarcieri

bignp256/benches/field.rs

@@ -1,6 +1,6 @@
 //! bign-curve256v1 `FieldElement` benchmarks
 
-use bignp256::arithmetic::FieldElement;
+use bignp256::FieldElement;
 use criterion::{criterion_group, criterion_main};
 
 const FE_A: FieldElement = FieldElement::from_hex_vartime(

bignp256/src/lib.rs

@@ -43,11 +43,14 @@ pub use {
     secret_key::SecretKey,
 };
 
+#[cfg(feature = "arithmetic")]
+pub use arithmetic::FieldElement;
+
 /// Bign256 result type
 pub type Result<T> = core::result::Result<T, Error>;
 
 #[cfg(feature = "arithmetic")]
-pub mod arithmetic;
+pub(crate) mod arithmetic;
 
 #[cfg(any(feature = "test-vectors", test))]
 pub mod test_vectors;