Nim Version

Nim Compiler Version 2.3.1 [Linux: amd64]
Compiled at 2025-09-25
Copyright (c) 2006-2025 by Andreas Rumpf

git hash: 9f74712
active boot switches: -d:release

Description

Nim 1.6.20 works as expected; the regression is present in Nim +2.0

type Conf = object
  val: int

const defaultConf = Conf(val: 123)

template foo(conf) =
  echo conf.val
  var conf2 = conf
  echo conf2.val

static:
  var conf = defaultConf
  conf = defaultConf  # removing this results in the expected output
  conf.val = 2
  foo(defaultConf)

Current Output

123
2

Expected Output

123
123

Known Workarounds

wrap the static body in a proc.

Additional Information

No response