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: gover.go
    path of file: ./repos/faasd/vendor/golang.org/x/tools/internal/versions
    
    the code of the file until where you have to start completion: // Copyright 2023 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.

// This is a fork of internal/gover for use by x/tools until
// go1.21 and earlier are no longer supported by x/tools.

package versions

import "strings"

// A gover is a parsed Go gover: major[.Minor[.Patch]][kind[pre]]
// The numbers are the original decimal strings to avoid integer overflows
// and since there is very little actual math. (Probably overflow doesn't matter in practice,
// but at the time this code was written, there
    
func parse(x string) gover {
	var v gover

	// Parse major version.
	var ok bool
	v.major, x, ok = cutInt(x)
	if !ok {
		return gover{}
	}
	if x == "" {
		// Interpret "1" as "1.0.0".
		v.minor = "0"
		v.patch = "0"
		return v
	}

	// Parse . before minor version.
	if x[0] != '.' {
		return gover{}
	}

	// Parse minor version.
	v.minor, x, ok = cutInt(x[1:])
	if !ok {
		return gover{}
	}
	if x == "" {
		// Patch missing is same as "0" for older versions.
		// Starting in Go 1.21, patch missing is different from explicit .0.
		if cmpInt(v.minor, "21") < 0 {
			v.patch = "0"
		}
		return v
	}

	// Parse patch if present.
	if x[0] == '.' {
		v.patch, x, ok = cutInt(x[1:])
		if !ok || x != "" {
			// Note that we are disallowing prereleases (alpha, beta, rc) for patch releases here (x != "").
			// Allowing them would be a bit confusing because we already have:
			//	1.21 < 1.21rc1
			// But a prerelease of a patch would have the opposite effect:
			//	1.21.3rc1 < 1.21.3
			// We've never needed them before, so let's not start now.
			return gover{}
		}
		return v
	}

	// Parse prerelease.
	i := 0
	for i < len(x) && (x[i] < '0' || '9' < x[i]) {
		if x[i] < 'a' || 'z' < x[i] {
			return gover{}
		}
		i++
	}
	if i == 0 {
		return gover{}
	}
	v.kind, x = x[:i], x[i:]
	if x == "" {
		return v
	}
	v.pre, x, ok = cutInt(x)
	if !ok || x != "" {
		return gover{}
	}

	return v
}