feat: make indexmap and indexset no-std

Author: iajoiner

src/lib.rs

@@ -98,7 +98,6 @@
 //!   [`with_capacity_and_hasher`][IndexMap::with_capacity_and_hasher] instead.
 //!   A no-std compatible hasher will be needed as well, for example
 //!   from the crate `twox-hash`.
-//! - Macros [`indexmap!`] and [`indexset!`] are unavailable without `std`.
 
 #![cfg_attr(docsrs, feature(doc_cfg))]
 

src/macros.rs

@@ -1,5 +1,3 @@
-#[cfg(feature = "std")]
-#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
 #[macro_export]
 /// Create an [`IndexMap`][crate::IndexMap] from a list of key-value pairs
 ///
@@ -26,7 +24,8 @@ macro_rules! indexmap {
             // Note: `stringify!($key)` is just here to consume the repetition,
             // but we throw away that string literal during constant evaluation.
             const CAP: usize = <[()]>::len(&[$({ stringify!($key); }),*]);
-            let mut map = $crate::IndexMap::with_capacity(CAP);
+            #[allow(unused_mut)]
+            let mut map = $crate::IndexMap::with_capacity_and_hasher(CAP, <_>::default());
             $(
                 map.insert($key, $value);
             )*
@@ -35,8 +34,6 @@ macro_rules! indexmap {
     };
 }
 
-#[cfg(feature = "std")]
-#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
 #[macro_export]
 /// Create an [`IndexSet`][crate::IndexSet] from a list of values
 ///
@@ -63,7 +60,8 @@ macro_rules! indexset {
             // Note: `stringify!($value)` is just here to consume the repetition,
             // but we throw away that string literal during constant evaluation.
             const CAP: usize = <[()]>::len(&[$({ stringify!($value); }),*]);
-            let mut set = $crate::IndexSet::with_capacity(CAP);
+            #[allow(unused_mut)]
+            let mut set = $crate::IndexSet::with_capacity_with_hasher(CAP, <_>::default());
             $(
                 set.insert($value);
             )*