compilation_unit {
  package_statement {
    package_name: "ExplorerTest"
  }
  is_api: true
  declarations {
    impl {
      kind: ExternalImpl
      impl_type {
        int_type_literal {
        }
      }
      interface {
        string_type_literal {
        }
      }
    }
  }
  declarations {
    function {
      name {
        name: "Main"
      }
      param_pattern {
      }
      return_term {
        kind: Expression
        type {
          int_type_literal {
          }
        }
      }
      body {
      }
    }
  }
}