regression from refc to ORC in stack usage of data specified to be entirely on heap #25688
Description
Nim Version
Nim Compiler Version 2.2.8 [Linux: amd64]
Compiled at 2026-04-01
Copyright (c) 2006-2026 by Andreas Rumpf
git hash: 4f500679b196fad944caa50a753f5bbfaefda001
active boot switches: -d:release
Nim Compiler Version 2.2.9 [Linux: amd64]
Compiled at 2026-04-01
Copyright (c) 2006-2026 by Andreas Rumpf
git hash: 03df884f023dd2c9c5a5121de2e4b80bc17b1b18
active boot switches: -d:release
Nim Compiler Version 2.3.1 [Linux: amd64]
Compiled at 2026-04-01
Copyright (c) 2006-2026 by Andreas Rumpf
git hash: 9c07bb94c1eb170f3b358043cff40d12d7fcd5ae
active boot switches: -d:release
Description
type
S = object
p: array[5 * 1024 * 1024, byte]
q: seq[byte]
F = object
case k: bool
of false: a: S
of true: b: S
proc u(x: S): S = discard
proc m(v: var F) =
case v.k
of false:
let r = (ref F)(k: true)
r[].b = u(v.a)
v = move(r[])
of true: discard
let s = (ref F)(k: false)
m(s[])Current Output
......................................................................
CC: system/exceptions.nim
CC: std/private/digitsutils.nim
CC: system/dollars.nim
CC: system.nim
CC: d.nim
Hint: [Link]
Hint: mm: orc; threads: on; opt: none (DEBUG BUILD, `-d:release` generates faster code)
29397 lines; 0.513s; 38.055MiB peakmem; proj: /tmp/d.nim; out: /tmp/d [SuccessX]
Hint: /tmp/d [Exec]
Segmentation fault
Error: execution of an external program failed: '/tmp/d'
Expected Output
No segmentation fault
Known Workarounds
No response
Additional Information
No response