From 5b5706cdeebffc859479021d20b9867a5789880a Mon Sep 17 00:00:00 2001
From: Nick Treleaven <ntrel002@gmail.com>
Date: Mon, 13 Apr 2026 12:41:14 +0100
Subject: [PATCH] [spec/statement] Clarify `foreach` restrictions

---
 spec/statement.dd | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/spec/statement.dd b/spec/statement.dd
index 3395e0413af4..332296466d8a 100644
--- a/spec/statement.dd
+++ b/spec/statement.dd
@@ -1274,6 +1274,9 @@ $(H3 $(LNAME2 foreach_restrictions, Foreach Restrictions))
         while `foreach` is iterating over the elements.
         )
 
+        $(UNDEFINED_BEHAVIOR If one of those operations occurs and it is `@system`.)
+        $(IMPLEMENTATION_DEFINED If resizing or reassignment occurs and it is `@safe`.)
+
 --------------
 int[] a = [1, 2, 3];
 auto fun = { a ~= 4; };