I'm not really sure if I would consider that a bug.

b is a bad name for a proc/template anyway. An ambiguous call might improve 
this though.

this works:
    
    
    import sequtils
    
    type
      Color1 = array[1, int]
      Color2 = array[1, int]
      Color = Color1 | Color2
      Image1 = seq[seq[Color1]]
      Image2 = seq[seq[Color2]]
      Image = Image1 | Image2
    
    template foo(c: Color) = discard
    
    proc appl(img: Image, k: seq[seq[int]]) =
      echo k.foldl(a + b.foldl(a + b), 0)
    
    appl @[@[[1]]], @[@[0]]
    

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