Bug with implicit conversion to proc types within varargs

[Hi02hi]

What happened?

I was trying to have a function which uses both procedures and varargs, but it refused to implicitly convert

type F = proc (x: int)

func exampleF(x: int) = 
  discard

func exampleF2(x: int) = 
  discard

proc applyF(x: int, f1, f2: F) = 
  f1(x)
  f2(x)

applyF(3, exampleF, exampleF2)

works but

# ...

proc applyF(x: int, fs: varargs[F]) = 
  for f in fs:
    f(x)

applyF(3, exampleF, exampleF2)

complains that the example F's are not actually F's

I can manually convert them by doing

# ...

proc applyF(x: int, fs: varargs[F]) = 
  for f in fs:
    f(x)

applyF(3, F(exampleF), F(exampleF2))

but note that both of these work, proving implicit conversion is allowed in other cases

proc applyF(x: int, fs: varargs[F]) = 
  for f in fs:
    f(x)

let
  test1: F = exampleF
  test2: F = exampleF2

applyF(3, test1, test2)

# ...

proc applyF(x: int, fs: varargs[F]) = 
  for f in fs:
    f(x)

applyF(3, [F(exampleF), exampleF2])

Nim Version

Nim Compiler Version 1.6.6 [Linux: amd64]
Compiled at 2022-05-05
Copyright (c) 2006-2021 by Andreas Rumpf

git hash: 0565a70
active boot switches: -d:release

Current Standard Output Logs

No response

Expected Standard Output Logs

No response

Possible Solution

Currently, I am using the last code snippet there as a workaround, but it would be nice if the implicit conversion would be consistent.

Additional Information

Thank you for the nice form for bug reports :)

[bung87]

need change to type F = proc (x: int){.nimcall.} , the F proc type without call conversation is closure, so it doesn't match, I know the error message is not obvious.