tags := map[string]bool{}
			shouldBuild, binaryOnly, err := ctx.shouldBuild([]byte(tt.content), tags)
			if shouldBuild != tt.shouldBuild || binaryOnly != tt.binaryOnly || !reflect.DeepEqual(tags, tt.tags) || err != tt.err {
				t.Errorf("mismatch:\n"+
					"have shouldBuild=%v, binaryOnly=%v, tags=%v, err=%v\n"+
					"want shouldBuild=%v, binaryOnly=%v, tags=%v, err=%v",
					shouldBuild, binaryOnly, tags, err,

	// Look for +build comments to accept or reject the file.
	info.goBuildConstraint, info.plusBuildConstraints, info.binaryOnly, err = getConstraints(info.header)
	if err != nil {
		return nil, fmt.Errorf("%s: %v", name, err)
	}

	if ignoreBinaryOnly && info.binaryOnly {
		info.binaryOnly = false // override info.binaryOnly
	}

	return info, nil
}

		isXTest := false
		if isTest && strings.HasSuffix(tf.pkgName(), "_test") && p.Name != tf.pkgName() {
			isXTest = true
			pkg = pkg[:len(pkg)-len("_test")]
		}

		if !isTest && tf.binaryOnly() {
			p.BinaryOnly = true
		}

		if p.Name == "" {
			p.Name = pkg
			firstFile = name
		} else if pkg != p.Name {
			// TODO(#45999): The choice of p.Name is arbitrary based on file iteration

pkg debug/elf, type R_390 int
pkg encoding/json, method (*Encoder) SetEscapeHTML(bool)
pkg encoding/json, method (*Encoder) SetIndent(string, string)
pkg go/build, type Package struct, BinaryOnly bool
pkg go/build, type Package struct, CgoFFLAGS []string
pkg go/build, type Package struct, FFiles []string
pkg go/doc, type Example struct, Unordered bool
pkg io, const SeekCurrent = 1

        StaleReason    string   // explanation for Stale==true
        Root           string   // Go root or Go path dir containing this package
        ConflictDir    string   // this directory shadows Dir in $GOPATH
        BinaryOnly     bool     // binary-only package (no longer supported)
        ForTest        string   // package is only for use in named test
        Export         string   // file containing export data (when using -export)