Ast_external (melange.Melange_ppx_lib.Ast

let handleExternalInSig: 
  Melange_compiler_libs.Ast_mapper.mapper =>
  Melange_compiler_libs.Parsetree.value_description =>
  Melange_compiler_libs.Parsetree.signature_item =>
  Melange_compiler_libs.Parsetree.signature_item;

let handleExternalInStru: 
  Melange_compiler_libs.Ast_mapper.mapper =>
  Melange_compiler_libs.Parsetree.value_description =>
  Melange_compiler_libs.Parsetree.structure_item =>
  Melange_compiler_libs.Parsetree.structure_item;