Assume support for const-generics

build.rs

@@ -4,6 +4,5 @@ fn main() {
  Some(_) => autocfg::emit("has_std"),
  None => autocfg::new().emit_sysroot_crate("std"),
  }
- autocfg::new().emit_rustc_version(1, 51);
  autocfg::rerun_path("build.rs");
 }

src/map.rs

@@ -1391,7 +1391,7 @@ where
  }
 }
 
-#[cfg(all(has_std, rustc_1_51))]
+#[cfg(has_std)]
 impl<K, V, const N: usize> From<[(K, V); N]> for IndexMap<K, V, RandomState>
 where
  K: Hash + Eq,
@@ -1906,7 +1906,7 @@ mod tests {
  }
 
  #[test]
- #[cfg(all(has_std, rustc_1_51))]
+ #[cfg(has_std)]
  fn from_array() {
  let map = IndexMap::from([(1, 2), (3, 4)]);
  let mut expected = IndexMap::new();

src/set.rs

@@ -888,7 +888,7 @@ where
  }
 }
 
-#[cfg(all(has_std, rustc_1_51))]
+#[cfg(has_std)]
 impl<T, const N: usize> From<[T; N]> for IndexSet<T, RandomState>
 where
  T: Eq + Hash,
@@ -1882,7 +1882,7 @@ mod tests {
  }
 
  #[test]
- #[cfg(all(has_std, rustc_1_51))]
+ #[cfg(has_std)]
  fn from_array() {
  let set1 = IndexSet::from([1, 2, 3, 4]);
  let set2: IndexSet<_> = [1, 2, 3, 4].into();