Feature gate the NonZero implementations

Author: GnomedDev

Cargo.toml

@@ -17,3 +17,6 @@ ryu = "1.0.17"
 
 [dev-dependencies]
 paste = "1"
+
+[features]
+nonzero_impls = []

README.md

@@ -4,4 +4,6 @@ A no-std version of ToString implemented for bool/integer/float types formatting
 
 ## Minimum Supported Rust Version
 
-This is currently 1.56, and is considered a breaking update to increase.
+This is currently 1.56 with no features active, and is considered a breaking update to increase.
+
+- Using the `nonzero_impls` feature, this increases to 1.79.

src/lib.rs

@@ -3,6 +3,8 @@
 //! ## Minimum Supported Rust Version
 //!
 //! This is currently 1.56, and is considered a breaking update to increase.
+//!
+//! - Using the `nonzero_impls` feature, this increases to 1.79.
 
 #![no_std]
 #![warn(clippy::pedantic)]

src/macros.rs

@@ -24,6 +24,7 @@ macro_rules! impl_int {
             }
         }
 
+        #[cfg(feature = "nonzero_impls")]
         impl ToArrayString for core::num::NonZero<$type> {
             const MAX_LENGTH: usize = $len;
             type ArrayString = ArrayString<$len>;
@@ -56,6 +57,8 @@ macro_rules! generate_test {
             #[test]
             fn [<check_ $type>]() {
                 test_impl($type::MIN, $type::MAX);
+
+                #[cfg(feature = "nonzero_impls")]
                 test_impl(core::num::NonZero::<$type>::MIN, core::num::NonZero::<$type>::MAX);
             }
         )*);