Nim/tests/macros/tlocktypednode3.nim

discard """
errormsg: "typechecked nodes may not be modified"
"""

import macros

macro doSomething(arg: typed): untyped =
  echo arg.treeREpr
  result = arg
  result.add(
    newCall(bindSym"echo", newLit(3)),
    newCall(bindSym"echo", newLit(1))
  )

doSomething((echo(1); echo(2)))