expression 'exit_14240299' has no type (or is ambiguous)

[zevv]

import cps

type C = ref object of RootObj
  fn*: proc(c: C): C {.nimcall.}

proc add1(val: var int): C {.cpsMagic.} =
  inc val

proc f(): C {.cps.} =
  var a: int
  cps add1(a)
  if true:
    cps add1(a)
    if true:
      cps add1(a)
  doAssert a == 3

=== .cps. on f ===

type
  env_14240156 = ref object {.cpsLift.}of C
    a: int

proc after_14240296(locals_14240313: C): C =
  
proc after_14240307(locals_14240312: C): C =
  
proc after_14240307(locals_14240312: C): C =
  ## installing locals for env env
  var a: int = env_14240156(locals_14240312).a
  ## add if body
  if true:
    return add1(env_14240156(fn: exit_14240299, a: a).C, a)
    ## post-cps call; time to bail
    ## split at: after - no body left
    return env_14240156(fn: exit_14240299, a: a).C
  ## split at: maybe - no body left
  return env_14240156(fn: exit_14240299, a: a).C

proc exit_14240299(locals_14240300: C): C =
  
proc exit_14240299(locals_14240300: C): C =
  ## installing locals for env env
  var a: int = env_14240156(locals_14240300).a
  doAssert a == 3

proc after_14240296(locals_14240313: C): C =
  ## installing locals for env env
  var a: int = env_14240156(locals_14240313).a
  if true:
    return add1(env_14240156(fn: after_14240307, a: a).C, a)
    ## post-cps call; time to bail
    ## split at: after
    ## new tail call: after_14240307
    return env_14240156(fn: after_14240307, a: a).C
    ## creating a new proc: after_14240307
  ## add the exit proc definition
  ## split at: exit
  ## new tail call: exit_14240299
  return env_14240156(fn: exit_14240299, a: a).C
  ## creating a new proc: exit_14240299
  
proc f(): C =
  var a: int
  return add1(env_14240156(fn: after_14240296, a: a).C, a)
  ## post-cps call; time to bail
  ## split at: after
  ## new tail call: after_14240296
  return env_14240156(fn: after_14240296, a: a).C
  ## creating a new proc: after_14240296
  
/home/ico/sandbox/prjs/cps/t.nim(10, 15) template/generic instantiation of `cps` from here
/home/ico/sandbox/prjs/cps/cps.nim(368, 21) Error: expression 'exit_14240299' has no type (or is ambiguous)```