Barycentric interpolator produce a codegen error with --gc:arc

[Clonkk]

var ptsCoord = newSeq[array[2, float]]()
# corners
ptsCoord.add([-200.0,-150.0])
ptsCoord.add([-200.0,150.0])
ptsCoord.add([200.0,-150.0])
ptsCoord.add([200.0,150.0])
var ptsValue = @[0.0,1.0,4.0,5.0]
# extra pts
ptsCoord.add([0.0,-150.0])
ptsCoord.add([0.0,150.0])
ptsCoord.add([0.0,0.0])
ptsValue.add(8.0)
ptsValue.add(1.0)
ptsValue.add(1.0)
let bary = newBarycentric2D(ptsCoord.toTensor(), ptsValue.toTensor())

Compiled with nim cpp --gc:arc with Nim 1.6.0

It seems related to Vector2 in cdt