remove conditional trait implementation

libraries/crypto/src/ec/exponent256.rs

@@ -18,11 +18,10 @@ use core::ops::Mul;
 use subtle::{self, Choice, ConditionallySelectable, CtOption};
 
 // An exponent on the elliptic curve, that is an element modulo the curve order N.
-#[derive(Clone, Copy, PartialEq, Eq)]
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
 // TODO: remove this Default once https://github.com/dalek-cryptography/subtle/issues/63 is
 // resolved.
 #[derive(Default)]
-#[cfg_attr(feature = "derive_debug", derive(Debug))]
 pub struct ExponentP256 {
     int: Int256,
 }
@@ -92,11 +91,10 @@ impl Mul for &ExponentP256 {
 }
 
 // A non-zero exponent on the elliptic curve.
-#[derive(Clone, Copy, PartialEq, Eq)]
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
 // TODO: remove this Default once https://github.com/dalek-cryptography/subtle/issues/63 is
 // resolved.
 #[derive(Default)]
-#[cfg_attr(feature = "derive_debug", derive(Debug))]
 pub struct NonZeroExponentP256 {
     e: ExponentP256,
 }

libraries/crypto/src/ec/gfp256.rs

@@ -111,7 +111,6 @@ impl Mul for &GFP256 {
     }
 }
 
-#[cfg(feature = "derive_debug")]
 impl core::fmt::Debug for GFP256 {
     fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
         write!(f, "GFP256::{:?}", self.int)

libraries/crypto/src/ec/int256.rs

@@ -636,7 +636,6 @@ impl SubAssign<&Int256> for Int256 {
     }
 }
 
-#[cfg(feature = "derive_debug")]
 impl core::fmt::Debug for Int256 {
     fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
         write!(f, "Int256 {{ digits: {:08x?} }}", self.digits)

libraries/crypto/src/ec/point.rs

@@ -542,7 +542,6 @@ impl Add for &PointProjective {
     }
 }
 
-#[cfg(feature = "derive_debug")]
 impl core::fmt::Debug for PointP256 {
     fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
         f.debug_struct("PointP256")
@@ -552,7 +551,6 @@ impl core::fmt::Debug for PointP256 {
     }
 }
 
-#[cfg(feature = "derive_debug")]
 impl PartialEq for PointP256 {
     fn eq(&self, other: &PointP256) -> bool {
         self.x == other.x && self.y == other.y