From 0a58af8cbf755d7c8f33bf3c201669a94c0e69c3 Mon Sep 17 00:00:00 2001
From: ringabout <43030857+ringabout@users.noreply.github.com>
Date: Wed, 16 Aug 2023 19:46:44 +0800
Subject: [PATCH] fixes #22357; don't sink elements of var tuple cursors
 (#22486)

(cherry picked from commit 940b1607b8459b4b7b7e20d316bec95c8de85809)
---
 compiler/injectdestructors.nim | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/compiler/injectdestructors.nim b/compiler/injectdestructors.nim
index 590012806c..1cada5376e 100644
--- a/compiler/injectdestructors.nim
+++ b/compiler/injectdestructors.nim
@@ -185,7 +185,9 @@ proc isCursor(n: PNode): bool =
 template isUnpackedTuple(n: PNode): bool =
   ## we move out all elements of unpacked tuples,
   ## hence unpacked tuples themselves don't need to be destroyed
-  (n.kind == nkSym and n.sym.kind == skTemp and n.sym.typ.kind == tyTuple)
+  ## except it's already a cursor
+  (n.kind == nkSym and n.sym.kind == skTemp and
+   n.sym.typ.kind == tyTuple and sfCursor notin n.sym.flags)
 
 proc checkForErrorPragma(c: Con; t: PType; ri: PNode; opname: string; inferredFromCopy = false) =
   var m = "'" & opname & "' is not available for type <" & typeToString(t) & ">"