package main_test

import "testing"

func TestBoringInternalLink(t *testing.T) {
	tg := testgo(t)
	defer tg.cleanup()
	tg.parallel()
	tg.tempFile("main.go", `package main
		import "crypto/sha1"
		func main() {
			sha1.New()
		}`)
	tg.run("build", "-ldflags=-w -extld=false", tg.path("main.go"))
	tg.run("build", "-ldflags=-extld=false", tg.path("main.go"))

		In: `package main

import (
	"asn1"
	"crypto"
	"crypto/rsa"
	_ "crypto/sha1"
	"crypto/x509"
	"crypto/x509/pkix"
	"time"
)

var x = 1
`,
		Out: `package main

import (
	"crypto"
	"crypto/rsa"
	_ "crypto/sha1"
	"crypto/x509"
	"crypto/x509/pkix"
	"encoding/asn1"
	"time"
)

var x = 1
`,
	},
	{

package schema

import (
	"crypto/sha1"
	"encoding/hex"
	"regexp"
	"strings"
	"unicode/utf8"

	"github.com/jinzhu/inflection"
	"golang.org/x/text/cases"
	"golang.org/x/text/language"
)

// Namer namer interface
type Namer interface {
	TableName(table string) string
	SchemaName(table string) string
	ColumnName(table, column string) string
	JoinTableName(joinTable string) string
	RelationshipFKName(Relationship) string

	"runtime"
	"strings"

	"cmd/go/internal/base"
	"cmd/go/internal/cfg"
	"cmd/go/internal/fsys"
	"cmd/go/internal/gover"
	"cmd/go/internal/load"
	"cmd/go/internal/str"
	"cmd/internal/quoted"
	"crypto/sha1"
)

// Tests can override this by setting $TESTGO_TOOLCHAIN_VERSION.
var ToolchainVersion = runtime.Version()

// The Go toolchain.

type gcToolchain struct{}

func (gcToolchain) compiler() string {

	for i := 0; i < len(rev); i++ {
		c := rev[i]
		if '0' <= c && c <= '9' || 'a' <= c && c <= 'f' {
			continue
		}
		return false
	}
	return true
}

// ShortenSHA1 shortens a SHA1 hash (40 hex digits) to the canonical length
// used in pseudo-versions (12 hex digits).
func ShortenSHA1(rev string) string {
	if AllHex(rev) && len(rev) == 40 {
		return rev[:12]
	}
	return rev
}