Template is expanded during declared() check if the check is in a generic proc

[alaviss]

Example

template fooImpl() =
  discard

proc foo[T]() =
  when declared(fooImpl):
    fooImpl()
  else:
    {.error: "foo is not implemented for this target".}

foo[int]()

Current Output

test.nim(10, 4) template/generic instantiation of `foo` from here
test.nim(5, 17) Error: identifier expected, but got: 
discard

Additional Information

• Doesn't happen if the proc is not a generic.

$ nim -v
Nim Compiler Version 1.5.1 [Linux: amd64]
Compiled at 2021-01-05
Copyright (c) 2006-2020 by Andreas Rumpf

git hash: 2c2baa9fad1d144c42baf30ed004decdf8bb0483
active boot switches: -d:release -d:nimUseLinenoise