func (st *state) unnamedTypeName() AST {
	st.checkChar('U')
	st.checkChar('t')
	num := st.compactNumber()
	ret := &UnnamedType{Num: num}
	st.subs.add(ret)
	return ret
}

// constraintExpr parses a constraint expression. This is just a
// regular expression, but template parameters are handled specially.
func (st *state) constraintExpr() AST {
	st.checkChar('Q')

	hold := st.parsingConstraint

  wget -P "${download_dir}" "https://github.com/coredns/corefile-migration/releases/download/v1.0.17/corefile-tool-${host_arch}" >/dev/null 2>&1

  local -r checkSHA=$(sha256sum "${download_dir}/corefile-tool-${host_arch}" | cut -d " " -f 1)
  if [[ "${checkSHA}" != "${corefile_tool_SHA}" ]]; then
    echo "!!! CheckSum for the CoreDNS migration tool did not match !!!" >&2
    exit 1
  fi

	//  	}
	//  }
	InvalidExprSwitch

	/* control flow > select */

	// InvalidSelectCase occurs when a select case is not a channel send or
	// receive.
	//
	// Example:
	//  func checkChan(c <-chan int) bool {
	//  	select {
	//  	case c:
	//  		return true
	//  	default:
	//  		return false
	//  	}
	//  }
	InvalidSelectCase

	/* control flow > labels and jumps */

	//  	}
	//  }
	InvalidExprSwitch

	// InvalidSelectCase occurs when a select case is not a channel send or
	// receive.
	//
	// Example:
	//  func checkChan(c <-chan int) bool {
	//  	select {
	//  	case c:
	//  		return true
	//  	default:
	//  		return false
	//  	}
	//  }
	InvalidSelectCase