Add LowerExp and UpperExp implementations

Author: rick-de-water

library/core/src/num/nonzero.rs

@@ -130,6 +130,8 @@ impl_nonzero_fmt!(Binary);
 impl_nonzero_fmt!(Octal);
 impl_nonzero_fmt!(LowerHex);
 impl_nonzero_fmt!(UpperHex);
+impl_nonzero_fmt!(LowerExp);
+impl_nonzero_fmt!(UpperExp);
 
 macro_rules! impl_nonzero_auto_trait {
     (unsafe $Trait:ident) => {

library/core/tests/nonzero.rs

@@ -354,3 +354,11 @@ fn test_signed_nonzero_neg() {
     assert_eq!((-NonZero::<i128>::new(1).unwrap()).get(), -1);
     assert_eq!((-NonZero::<i128>::new(-1).unwrap()).get(), 1);
 }
+
+#[test]
+fn test_nonzero_fmt() {
+    let i = format!("{0}, {0:?}, {0:x}, {0:X}, {0:#x}, {0:#X}, {0:o}, {0:b}, {0:e}, {0:E}", 42);
+    let nz = format!("{0}, {0:?}, {0:x}, {0:X}, {0:#x}, {0:#X}, {0:o}, {0:b}, {0:e}, {0:E}", NonZero::new(42).unwrap());
+
+    assert_eq!(i, nz);
+}