From be59d94737e89d1d201c0731f2050935ae53a28d Mon Sep 17 00:00:00 2001
From: Paul Backus <snarwin@gmail.com>
Date: Wed, 20 Nov 2024 15:05:10 -0500
Subject: [PATCH] sumtype: avoid template recursion in handlerArgs

---
 std/sumtype.d | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/std/sumtype.d b/std/sumtype.d
index 015510eb4..849cf97ab 100644
--- a/std/sumtype.d
+++ b/std/sumtype.d
@@ -2102,10 +2102,17 @@ private size_t stride(size_t dim, lengths...)()
 private template handlerArgs(size_t caseId, typeCounts...)
 {
     enum tags = TagTuple!typeCounts.fromCaseId(caseId);
-    enum argsFrom(size_t i : tags.length) = "";
-    enum argsFrom(size_t i) = "args[" ~ toCtString!i ~ "].get!(SumTypes[" ~ toCtString!i ~ "]" ~
-        ".Types[" ~ toCtString!(tags[i]) ~ "])(), " ~ argsFrom!(i + 1);
-    enum handlerArgs = argsFrom!0;
+
+    alias handlerArgs = AliasSeq!();
+
+    static foreach (i; 0 .. tags.length)
+    {
+        handlerArgs = AliasSeq!(
+            handlerArgs,
+            "args[" ~ toCtString!i ~ "].get!(SumTypes[" ~ toCtString!i ~ "]" ~
+            ".Types[" ~ toCtString!(tags[i]) ~ "])(), "
+        );
+    }
 }
 
 // Matching