@code_llvm gradient(x -> 5x + 3, 1)
; Function gradient
; Location: /home/mike/projects/flux/Zygote.jl/src/compiler/interface.jl:48
define [1 x i64] @julia_gradient_34502(i64) {
top:
; Location: /home/mike/projects/flux/Zygote.jl/src/compiler/interface.jl:50
  ret [1 x i64] [i64 5]
}