diff --git a/alloc.d b/alloc.d
index c5d256d..2448341 100644
--- a/alloc.d
+++ b/alloc.d
@@ -90,6 +90,14 @@ AllocCopy(T)(T[] target)
 	return arr;
 }
 
+T[]
+AllocCopySlice(T)(T[] target, u64 start, u64 len)
+{
+	T[] arr = Alloc!(T)(len);
+	arr[0 .. $] = target[start .. start+len];
+	return arr;
+}
+
 T[]
 AllocArray(T)(u64 count)
 {
@@ -218,6 +226,14 @@ AllocCopy(T)(Arena* arena, T[] target)
 	return arr;
 }
 
+T[]
+AllocCopySlice(T)(Arena* arena, T[] target, u64 start, u64 len)
+{
+	T[] arr = Alloc!(T)(arena, len);
+	arr[0 .. $] = target[start .. start+len];
+	return arr;
+}
+
 T* 
 Alloc(T)(Arena* arena)
 {
@@ -330,6 +346,14 @@ ScratchAllocCopy(T)(T[] target)
 	return arr;
 }
 
+T[]
+ScratchAllocCopySlice(T)(T[] target, u64 start, u64 len)
+{
+	T[] arr = ScratchAlloc!(T)(len);
+	arr[0 .. $] = target[start .. start+len];
+	return arr;
+}
+
 unittest
 {
 	{