From 7ccda2e69b29973a77ef77c607574075b77d8167 Mon Sep 17 00:00:00 2001
From: Sam Vervaeck <samvv@pm.me>
Date: Sun, 21 Jan 2024 02:01:31 +0100
Subject: [PATCH] Fix segfault when `CField` has been substituted

---
 bootstrap/cxx/src/Checker.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bootstrap/cxx/src/Checker.cc b/bootstrap/cxx/src/Checker.cc
index f5f7a0ee3..2e0578405 100644
--- a/bootstrap/cxx/src/Checker.cc
+++ b/bootstrap/cxx/src/Checker.cc
@@ -35,7 +35,7 @@ namespace bolt {
         auto Field = static_cast<CField*>(this);
         auto NewTupleTy = Field->TupleTy->substitute(Sub);
         auto NewFieldTy = Field->FieldTy->substitute(Sub);
-        return new CField(NewTupleTy, Field->I, NewFieldTy);
+        return new CField(NewTupleTy, Field->I, NewFieldTy, Field->Source);
       }
       case ConstraintKind::Empty:
         return this;