int

src/lib.rs

@@ -1,6 +1,8 @@
 #![feature(ptr_metadata)]
+#![feature(trace_macros)]
 
 mod cfg_match;
+mod unroll_int;
 mod unsized_clone;
 
 pub use unsized_clone::*;

src/unroll_int.rs

@@ -0,0 +1,38 @@
+macro_rules! create_unroll_int {
+    // (_, 5) => 5
+    (replace@ ($a:tt, $($b:tt)*)) => { $($b)* };
+
+    // 2, 1, 0 => [0, 0, 0]
+    (turn_into_zero_array@ $($num:literal)*) => {
+        [$( create_unroll_int!(replace@ ($num, 0)) ),*]
+    };
+
+    ($first:literal $($rest:literal)* | $($acc:tt)*) => {
+        create_unroll_int! {
+            $($rest)*
+            |
+            ($first) => { create_unroll_int!(turn_into_zero_array@ $($rest)*) };
+            $($acc)*
+        }
+    };
+
+    (| $($acc:tt)*) => {
+        macro_rules! unroll_int {
+            $($acc)*
+        }
+    };
+
+    ($($num:literal)*) => {
+        create_unroll_int! { $($num)* | }
+    };
+}
+
+create_unroll_int! {
+    // 20 19 18 17 16 15 14 13 12 11
+    //10 9 8 7 6 5 4 3
+    2 1 0
+}
+
+fn x() {
+    let x = unroll_int!(0);
+}