Custom iterator is not found if used in template function, if used from a third file

[tsoj]

Description

The following code doesn't compile with nim r main.nim:

main.nim:

import piecevalue

getPieceValue[int]()

piecevalue.nim:

import bitboard

func getPieceValue*[T]() =
  for square in 0.uint64:
    discard

bitboard.nim:

iterator items*(bitboard: uint64): int =
  discard

Nim Version

Nim Compiler Version 2.1.9 [Linux: amd64] Compiled at 2024-07-13 Copyright (c) 2006-2024 by Andreas Rumpf

git hash: f6aeca5765bb48abc6efbe35e4ea6accf127d072 active boot switches: -d:release

Current Output

Hint: used config file '/home/tsoj/.choosenim/toolchains/nim-#devel/config/nim.cfg' [Conf]
Hint: used config file '/home/tsoj/.choosenim/toolchains/nim-#devel/config/config.nims' [Conf]
.......................................................................
/tmp/testtest/piecevalue.nim(1, 8) Warning: imported and not used: 'bitboard' [UnusedImport]
/tmp/testtest/main.nim(3, 14) template/generic instantiation of `getPieceValue` from here
/tmp/testtest/piecevalue.nim(4, 18) Error: type mismatch
Expression: items(uint64(0))
  [1] uint64(0): uint64

Expected one of (first mismatch at [position]):
[1] iterator items(a: cstring): char
[1] iterator items(a: string): char
[1] iterator items[IX, T](a: array[IX, T]): T
[1] iterator items[T: Ordinal](s: Slice[T]): T
[1] iterator items[T: char](a: openArray[T]): T
[1] iterator items[T: enum and Ordinal](E: typedesc[T]): T
[1] iterator items[T: not char](a: openArray[T]): lent2 T
[1] iterator items[T](a: seq[T]): lent2 T
[1] iterator items[T](a: set[T]): T

Expected Output

Should compile

Possible Solution

No response

Additional Information

When changing in main.nim the code to:

import piecevalue, bitboard

getPieceValue[int]()

it works.

[Araq]

Very old, known bug that has been reported multiple times by now. The generic prepass doesn't understand the implicit items/pairs iterator invokations and maybe these were a bad idea.