Non mutable Deref is unreachable

Author: arnodb

Cargo.toml

@@ -8,3 +8,6 @@ description = "Iteratively stack mutable references"
 documentation = "https://docs.rs/ref_mut_stack"
 repository = "https://github.com/arnodb/ref_mut_stack"
 readme = "README.md"
+
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(coverage,coverage_nightly)'] }

src/lib.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(coverage_nightly, feature(coverage_attribute))]
+
 use std::{
     ops::{Deref, DerefMut},
     ptr::NonNull,
@@ -77,6 +79,7 @@ impl<T> Drop for SafeDropVec<T> {
 
 impl<T> Deref for SafeDropVec<T> {
     type Target = Vec<T>;
+    #[cfg_attr(coverage_nightly, coverage(off))]
     fn deref(&self) -> &Self::Target {
         &self.0
     }