Ppx_apply (melange.Melange_ppx_lib.Ppx

let apply_lazy: 
  source:string =>
  target:string =>
  (Melange_compiler_libs.Parsetree.structure =>
    Melange_compiler_libs.Parsetree.structure) =>
  (Melange_compiler_libs.Parsetree.signature =>
    Melange_compiler_libs.Parsetree.signature) =>
  unit;