# Test that go fix -diff exits with non-zero status when diffs exist,
# and exits with zero status when no diffs are needed.
# This is consistent with gofmt -d (#46289) and go mod tidy -diff (#27005).

# When the source needs fixes, go fix -diff should print the diff
# and exit with a non-zero code.
! go fix -diff example.com/needsfix
stdout 'net.JoinHostPort'

# When the source is already clean, go fix -diff should print nothing
# and exit with a zero code.
go fix -diff example.com/clean
! stdout .

-- go.mod --
module example.com
go 1.26

-- needsfix/x.go --
package needsfix

import (
	"fmt"
	"net"
)

var s string
var _, _ = net.Dial("tcp", fmt.Sprintf("%s:%d", s, 80))

-- clean/x.go --
package clean

import "net"

var s string
var _, _ = net.Dial("tcp", net.JoinHostPort(s, "80"))