omochimetaru

@swift-5.6.3 -Xfrontend -enable-experimental-forward-mode-differentiation

import _Differentiation @differentiable(_forward) func f(_ x: Float) -> Float { x * x } let dfdx = derivative(of: f) print(dfdx(3))

exit status: 1 with stderr:

<stdin>:3:17: error: unsupported differentiability kind '_forward'; only 'reverse' is supported @differentiable(_forward) ^~~~~~~~ reverse