lib/pure/collections

discard """
  errormsg: "'noSideEffect' can have side effects"
  file: "tsidee4.nim"
  line: 12
"""

var
  global: int

proc dontcare(x: int): int = return global

proc noSideEffect(x, y: int, p: proc (a: int): int {.noSideEffect.}): int {.noSideEffect.} =
  return x + y + dontcare(x)

echo noSideEffect(1, 3, dontcare) #ERROR_MSG type mismatch
Mode	Name	Size
-rw-r--r--	LockFreeHash.nim	19345	log stats plain blame
-rw-r--r--	critbits.nim	9645	log stats plain blame
-rw-r--r--	intsets.nim	5912	log stats plain blame
-rw-r--r--	lists.nim	9314	log stats plain blame
-rw-r--r--	queues.nim	2025	log stats plain blame
-rw-r--r--	sequtils.nim	20148	log stats plain blame
-rw-r--r--	sets.nim	27614	log stats plain blame
-rw-r--r--	tables.nim	29893	log stats plain blame