sugar.collect can't be used in templates

[dawkot]

Example

import sugar

template foo =
  discard collect(newSeq, for i in 1..3: i)

foo()

Current Output

Error: type mismatch: got <>
        ... but expected one of: 
        ... proc (s: var seq[int], len: Natural){.noSideEffect.}

Additional Information

• Nim 1.2.0

[Araq]

Workaround:

import sugar

template foo {.dirty.} =
  discard collect(newSeq, for i in 1..3: i)

foo()

[planetis-m]

Fixed by #16089