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Attaching a macro to an iterator cannot fill the body #16413

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codehz opened this issue Dec 20, 2020 · 0 comments · Fixed by #24440
Closed

Attaching a macro to an iterator cannot fill the body #16413

codehz opened this issue Dec 20, 2020 · 0 comments · Fixed by #24440

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@codehz
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codehz commented Dec 20, 2020 •
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Example

import macros

macro identity(x: untyped) =
  result = x.copy()
  result[6] = quote do:
    yield 1
  echo result.toStrLit

iterator demo(): int {.identity.}
iterator demo2(): int {.identity.} = discard # but this works as expected

Current Output

Hint: used config file '/playground/nim/config/nim.cfg' [Conf]
Hint: used config file '/playground/nim/config/config.nims' [Conf]
.....
iterator demo(): int =
  yield 1

/usercode/in.nim(9, 1) Error: implementation of 'demo' expected

Expected Output

no error

Additional Information

https://play.nim-lang.org/#ix=2IQF
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fix wrong error for iterators with no body and pragma macro metagn/Nim
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@codehz