/Users/kshitij/workspace/scratch/test.swift:7:18: error: incorrect argument label in call (have 'at:_:in:', expected 'at:_:of:')
 5 |   return [tuple.0, tuple.1]
 6 | }
 7 | let pb = pullback(at: Float(3), 4, in: { tupleElementGeneric($0, $1) })
   |                  `- error: incorrect argument label in call (have 'at:_:in:', expected 'at:_:of:')
 8 | print(pb(.init([1, 1])))
 9 |

/Users/kshitij/workspace/scratch/test.swift:8:11: error: cannot infer contextual base in reference to member 'init'
 6 | }
 7 | let pb = pullback(at: Float(3), 4, in: { tupleElementGeneric($0, $1) })
 8 | print(pb(.init([1, 1])))
   |           `- error: cannot infer contextual base in reference to member 'init'
 9 |
10 | //   Actual: (0.0, 2.0)