Ppx_entry (melange.Melange_ppx_lib.Ppx

let unsafe_mapper: Melange_compiler_libs.Ast_mapper.mapper;

let rewrite_signature: 
  Melange_compiler_libs.Parsetree.signature =>
  Melange_compiler_libs.Parsetree.signature;

let rewrite_implementation: 
  Melange_compiler_libs.Parsetree.structure =>
  Melange_compiler_libs.Parsetree.structure;