You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: fe_generic.go
    path of file: ./repos/teller/vendor/filippo.io/edwards25519/field
    
    the code of the file until where you have to start completion: // Copyright (c) 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package field

import "math/bits"

// uint128 holds a 128-bit number as two 64-bit limbs, for use with the
// bits.Mul64 and bits.Add64 intrinsics.
type uint128 struct {
	lo, hi uint64
}

// mul64 returns a * b.
fun
    
func (v *Element) carryPropagateGeneric() *Element {
	c0 := v.l0 >> 51
	c1 := v.l1 >> 51
	c2 := v.l2 >> 51
	c3 := v.l3 >> 51
	c4 := v.l4 >> 51

	// c4 is at most 64 - 51 = 13 bits, so c4*19 is at most 18 bits, and
	// the final l0 will be at most 52 bits. Similarly for the rest.
	v.l0 = v.l0&maskLow51Bits + c4*19
	v.l1 = v.l1&maskLow51Bits + c0
	v.l2 = v.l2&maskLow51Bits + c1
	v.l3 = v.l3&maskLow51Bits + c2
	v.l4 = v.l4&maskLow51Bits + c3

	return v
}