Why this code produces a compiler warning： Warning: =destroy(t.c) can raise an unlisted exception: Exception

[haoyu234]

Description

https://play.nim-lang.org/#pasty=XdqZmWbb

type
  ChunkBase* {.acyclic.} = object of RootObj
    nextChunk: Chunk

  Chunk* = ref ChunkBase
  ChunkObj2 = object of ChunkBase
  Chunk2 = ref ChunkObj2
  
  Test = ref TestObj
  TestObj = object
    c: Chunk

proc `=destroy`(chunk: ChunkObj2) = discard

proc newChunk*(): owned Chunk {.inline.} =
  Chunk()

proc `=destroy`(t: TestObj) =
  `=destroy`(t.c)  # Warning: `=destroy`(t.c) can raise an unlisted exception: Exception [Effect]

What should I do to resolve the warning?

Nim Version

Nim Compiler Version 2.1.1 [Linux: amd64]
Compiled at 2024-05-30
Copyright (c) 2006-2024 by Andreas Rumpf

git hash: b172b34
active boot switches: -d:release

Current Output

Hint: used config file '/playground/nim/config/nim.cfg' [Conf]
Hint: used config file '/playground/nim/config/config.nims' [Conf]
......................................................................
/usercode/in.nim(18, 6) template/generic instantiation from here
/usercode/in.nim(19, 13) Warning: `=destroy`(t.c) can raise an unlisted exception: Exception [Effect]
/usercode/in.nim(7, 3) Hint: 'Chunk2' is declared but not used [XDeclaredButNotUsed]
/usercode/in.nim(9, 3) Hint: 'Test' is declared but not used [XDeclaredButNotUsed]

Expected Output

no warning

Possible Solution

No response

Additional Information

No response

[ringabout]

Slightly simplified

type
  Chunk* = ref object of RootObj
    nextChunk: Chunk

  TestObj = object
    c: Chunk

proc newChunk*(): Chunk =
  Chunk()

proc `=destroy`(t: TestObj) =
  `=destroy`(t.c)  # Warning: `=destroy`(t.c) can raise an unlisted exception: Exception [Effect]