matsuri doesn't work with Nim 1.4.2

[berquist]

From the figure example, using the latest version from GitHub:

/home/eric/development/speckledlemon/advent-of-code/2020/figures.nim(4, 9) template/generic instantiation of `variant` from here                                                                  
/home/eric/.nimble/pkgs/matsuri-0.3.0/matsuri.nim(199, 17) Error: type mismatch: got <untyped, int literal(0)>
but expected one of: 
proc `[]`(n: NimNode; i: BackwardsIndex): NimNode
  first type mismatch at position: 0
proc `[]`(n: NimNode; i: int): NimNode
  first type mismatch at position: 0
proc `[]`(s: string; i: BackwardsIndex): char
  first type mismatch at position: 0
proc `[]`[I: Ordinal; T](a: T; i: I): T
  first type mismatch at position: 0
proc `[]`[Idx, T, U, V](a: array[Idx, T]; x: HSlice[U, V]): seq[T]
  first type mismatch at position: 0
proc `[]`[Idx, T](a: array[Idx, T]; i: BackwardsIndex): T
  first type mismatch at position: 0
proc `[]`[Idx, T](a: var array[Idx, T]; i: BackwardsIndex): var T
  first type mismatch at position: 0
proc `[]`[T, U, V](s: openArray[T]; x: HSlice[U, V]): seq[T]
  first type mismatch at position: 0
proc `[]`[T, U](n: NimNode; x: HSlice[T, U]): seq[NimNode]
  first type mismatch at position: 0
proc `[]`[T, U](s: string; x: HSlice[T, U]): string
  first type mismatch at position: 0
proc `[]`[T](s: openArray[T]; i: BackwardsIndex): T
  first type mismatch at position: 0
proc `[]`[T](s: var openArray[T]; i: BackwardsIndex): var T
  first type mismatch at position: 0
template `[]`(s: string; i: int): char
  first type mismatch at position: 0

expression: `[]`(right_13261071, 0)