Modules in nim

modules.nim

# Module A
var
  x*, y: int

proc `*` *(a, b: seq[int]): seq[int] =
  # allocate a new sequence:
  newSeq(result, len(a))
  # multiply two int sequences:
  for i in 0..len(a)-1: result[i] = a[i] * b[i]

when isMainModule:
  # test the new ``*`` operator for sequences:
  assert(@[1, 2, 3] * @[1, 2, 3] == @[1, 4, 9])
  
  
# Module C
import A, B
write(stdout, x) # error: x is ambiguous
write(stdout, A.x) # okay: qualifier used

var x = 4
write(stdout, x) # not ambiguous: uses the module C's x


import mymodule except y
from mymodule import x, y, z

from mymodule as m import nil

m.x()         # m is aliasing mymodule