bugfix: `slice.group_by` with empty array

diff --git a/core/container/slice.onyx b/core/container/slice.onyx
index 169d5172cca5d4b2908b2d15d7a82b39d04ce444..4eb7ba7cb461d7622f369601c5b14a2b5b0e4d65 100644 (file)
--- a/core/container/slice.onyx
+++ b/core/container/slice.onyx
@@ -637,6 +637,8 @@ group_by :: macro (arr: [] $T, comp: (T, T) -> bool, allocator := context.alloca
 #overload
 group_by :: macro (arr_: [] $T, comp: Code, allocator := context.allocator) -> [..] [] T {
     out := make([..] [] T, allocator);
+    if arr_.count == 0 do return out;
+
     start := 0;
     arr := arr_;
     for i: 1 .. arr.count {