libmono-cecil-private-cil 4.2.1.102+dfsg2-4ubuntu1 (amd64 binary) in ubuntu xenial

 Mono is a platform for running and developing applications based on the
 ECMA/ISO Standards. Mono is an open source effort led by Xamarin.
 Mono provides a complete CLR (Common Language Runtime) including compiler and
 runtime, which can produce and execute CIL (Common Intermediate Language)
 bytecode (aka assemblies), and a class library.
 .
 This package contains the private Mono.Cecil library that allows one to
 generate and inspect programs and libraries in the ECMA CIL format.