From bf3a2e010d2d87985975dd8e87e2bfb36e10d5e8 Mon Sep 17 00:00:00 2001
From: Andreas Rumpf <rumpf_a@web.de>
Date: Sat, 26 Mar 2022 06:37:04 +0100
Subject: [PATCH] mitigates #19364 [backport]; we make this bug more unlikely
 to appear by producing better code to begin with; real fix will come later
 (#19647)

(cherry picked from commit 12a0f88a52bae74e31d6d612f0e2aae3f90340a9)
---
 compiler/lowerings.nim | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/compiler/lowerings.nim b/compiler/lowerings.nim
index 37405d8d96..91c8bb7cc6 100644
--- a/compiler/lowerings.nim
+++ b/compiler/lowerings.nim
@@ -71,14 +71,20 @@ proc lowerTupleUnpacking*(g: ModuleGraph; n: PNode; idgen: IdGenerator; owner: P
   let value = n.lastSon
   result = newNodeI(nkStmtList, n.info)
 
-  var temp = newSym(skTemp, getIdent(g.cache, genPrefix), nextSymId(idgen),
-                    owner, value.info, g.config.options)
-  temp.typ = skipTypes(value.typ, abstractInst)
-  incl(temp.flags, sfFromGeneric)
+  var tempAsNode: PNode
+  let avoidTemp = value.kind == nkSym
+  if avoidTemp:
+    tempAsNode = value
+  else:
+    var temp = newSym(skTemp, getIdent(g.cache, genPrefix), nextSymId(idgen),
+                  owner, value.info, g.config.options)
+    temp.typ = skipTypes(value.typ, abstractInst)
+    incl(temp.flags, sfFromGeneric)
+    tempAsNode = newSymNode(temp)
 
   var v = newNodeI(nkVarSection, value.info)
-  let tempAsNode = newSymNode(temp)
-  v.addVar(tempAsNode, value)
+  if not avoidTemp:
+    v.addVar(tempAsNode, value)
   result.add(v)
 
   for i in 0..<n.len-2: