1 files changed, 29 insertions, 0 deletions
diff --git a/third_party/rust/itertools/src/impl_macros.rs b/third_party/rust/itertools/src/impl_macros.rs
new file mode 100644
index 0000000000..a029843b05
--- /dev/null
+++ b/third_party/rust/itertools/src/impl_macros.rs
@@ -0,0 +1,29 @@
+//! 
+//! Implementation's internal macros
+
+macro_rules! debug_fmt_fields {
+    ($tyname:ident, $($($field:tt/*TODO ideally we would accept ident or tuple element here*/).+),*) => {
+        fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+            f.debug_struct(stringify!($tyname))
+                $(
+              .field(stringify!($($field).+), &self.$($field).+)
+              )*
+              .finish()
+        }
+    }
+}
+
+macro_rules! clone_fields {
+    ($($field:ident),*) => {
+        #[inline] // TODO is this sensible?
+        fn clone(&self) -> Self {
+            Self {
+                $($field: self.$field.clone(),)*
+            }
+        }
+    }
+}
+
+macro_rules! ignore_ident{
+    ($id:ident, $($t:tt)*) => {$($t)*};
+}