-- .mod --
module example.com/fuzzfail

go 1.18
-- .info --
{"Version":"v0.2.0"}
-- go.mod --
module example.com/fuzzfail

go 1.18
-- fuzzfail_test.go --
package fuzzfail

import "testing"

func FuzzFail(f *testing.F) {
	f.Fuzz(func(t *testing.T, b []byte) {
		t.Fatalf("oops: %q", b)
	})
}
-- testdata/fuzz/FuzzFail/bbb0c2d22aa1a24617301566dc7486f8b625d38024603ba62757c1124013b49a --
go test fuzz v1

Module example.com/retract/description retracts all versions of itself.
The rationale comments have various problems.

-- .mod --
module example.com/retract/rationale

go 1.14

retract (
	v1.0.0-empty

	// short description
	// more
	//
	// detail
	v1.0.0-multiline1 // suffix
	// after not included
)

// short description
// more
//
// detail
retract v1.0.0-multiline2 // suffix

Module example.com/retract/self/prev is a module that retracts its own
latest version, as well as an earlier version.

A previous unretracted release version, v1.1.0, is still available.

-- .mod --
module example.com/retract/self/prev

go 1.15

retract v1.0.0-bad // bad
retract v1.9.0 // self

-- .info --
{"Version":"v1.9.0"}

-- p.go --

Module example.com/incompatiblewithsub has an incompatible version
and a package in a subdirectory.
-- .info --
{"Version":"v1.0.0"}
-- .mod --
module example.com/incompatiblewithsub
-- sub/sub.go --

Written by hand.
Test case for getting a package that has been moved to a different module.

-- .mod --
module example.com/split

require example.com/split/subpkg v1.1.0
-- .info --

example.com/cmd contains main packages.

v1.0.0 is the latest non-retracted version. Other versions contain errors or
detectable problems.

-- .info --
{"Version":"v1.0.0"}
-- .mod --
module example.com/cmd

go 1.16
-- go.mod --
module example.com/cmd

go 1.16
-- a/a.go --
package main

import "fmt"

func main() { fmt.Println("a@v1.0.0") }
-- b/b.go --
package main

import "fmt"

See example.com_retract_self_pseudo_v1.9.0.txt.

This version is not retracted. It should be returned by the proxy's
@latest endpoint. It should match the @latest version query.

TODO(golang.org/issue/24031): the proxy and proxy.golang.org both return
the highest release version from the @latest endpoint, even if that
version is retracted, so there is no way for the go command to
discover an unretracted pseudo-version.

-- .mod --

-- .info --
{"Version":"v1.0.0"}
-- .mod --
module example.com/deprecated/a

go 1.17
-- go.mod --
module example.com/deprecated/a

go 1.17
-- a.go --
package a

-- cmd/a/a.go --
package main

import "fmt"

Module example.com/retract/self/pseudo is a module that retracts its own
latest version, as well as an earlier version.

An unretracted pseudo-version is available.

-- .mod --
module example.com/retract/self/pseudo

go 1.15

retract v1.0.0-bad // bad
retract v1.9.0 // self

-- .info --

example.com/printversion v0.1.0

-- .mod --
module example.com/printversion
-- .info --
{"Version":"v0.1.0"}
-- README.txt --
There is no go.mod file for this version of the module.
-- printversion.go --
package main

import (
	"fmt"
	"os"
	"runtime/debug"

	_ "example.com/version"
)

func main() {
	info, _ := debug.ReadBuildInfo()
	fmt.Fprintf(os.Stdout, "path is %s\n", info.Path)