X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=src%2Flibrustc_data_structures%2Ffx.rs;h=bbeb193dba32b4c8970d8bc18160d4d2dd5563c7;hb=d493dccef7ae1d2ca739fe828bf9556b44dc460a;hp=cf73fe8cf85ceeac553ff1db97a0b43fb2f3077a;hpb=d132f544f9d74e3cc047ef211e57eae60b78e5c5;p=rust.git

diff --git a/src/librustc_data_structures/fx.rs b/src/librustc_data_structures/fx.rs
index cf73fe8cf85..bbeb193dba3 100644
--- a/src/librustc_data_structures/fx.rs
+++ b/src/librustc_data_structures/fx.rs
@@ -1,6 +1,14 @@
 use std::hash::BuildHasherDefault;
 
-pub use rustc_hash::{FxHasher, FxHashMap, FxHashSet};
+pub use rustc_hash::{FxHashMap, FxHashSet, FxHasher};
 
 pub type FxIndexMap<K, V> = indexmap::IndexMap<K, V, BuildHasherDefault<FxHasher>>;
 pub type FxIndexSet<V> = indexmap::IndexSet<V, BuildHasherDefault<FxHasher>>;
+
+#[macro_export]
+macro_rules! define_id_collections {
+    ($map_name:ident, $set_name:ident, $key:ty) => {
+        pub type $map_name<T> = $crate::fx::FxHashMap<$key, T>;
+        pub type $set_name = $crate::fx::FxHashSet<$key>;
+    };
+}