module Initial_env:The initial environment. It is empty except bindings for predefined things likesig..end
boolval initial_env : Typed_ast.envval read_target_constants : string -> Target.target -> Typed_ast.NameSet.tread_target_constants lib_path target reads the list of contants that should be
avoided for target target. These constants are read from a file lib_path/{target}_constants.
If this file does not exists, the empty set is returned.