Matthew Dempsky <******@****.***> 1660823770 -0700

func IsMark (r <type -21>) <type -15>;
func IsNumber (r <type -21>) <type -15>;
func IsOneOf (ranges <type 23 [] <type 24 *<type 2>>>, r <type -21>) <type -15>;
func IsPrint (r <type -21>) <type -15>;
func IsPunct (r <type -21>) <type -15>;
func IsSpace (r <type -21>) <type -15>;
func IsSymbol (r <type -21>) <type -15>;
func IsTitle (r <type -21>) <type -15>;
func IsUpper (r <type -21>) <type -15>;
var Javanese <type 1>;
var Join_Control <type 1>;

rm go.mod
go mod init m
go mod edit -go=1.14 -toolchain=go1.20
! go version
stderr 'go: downloading go1.20 '


# check for invalid GOTOOLCHAIN
env GOTOOLCHAIN=go1.14
go version
stdout 'go1.14'

env GOTOOLCHAIN=go1.20
! go version
stderr 'go: downloading go1.20 '

env GOTOOLCHAIN=go1.21
! go version

at 2019-05-09T18:56:25-04:00

git init

git add go.mod tagtests.go
git commit -m 'create module tagtests'
git branch -m master
git branch b

git add v0.2.1
git commit -m 'v0.2.1'
git tag 'v0.2.1'

git checkout b
git add 'v0.2.2'
git commit -m 'v0.2.2'
git tag 'v0.2.2'

git checkout master
git merge b -m 'merge'

git show-ref --tags --heads
cmp stdout .git-refs

        ['*:bar']               | ['org:bar:2.1']                   | ['com:foo:1.1']
        ['org:f*']              | ['org:foo:1.1']                   | ['com:bar:2.1']
        ['org:*']               | ['org:foo:1.1']                   | ['com:bar:2.1']
        ['or*:*']               | ['org:foo:1.1']                   | ['com:bar:2.1']
        ['*:*']                 | ['org:foo:1.1', 'com:bar:2.1']    | []
    }

# GOTOOLCHAIN=min+auto should run the newer toolchain
env GOTOOLCHAIN=go1.21+auto
go mod download rsc.io/needgo121@latest rsc.io/needgo122@latest rsc.io/needgo123@latest rsc.io/needall@latest
stderr '^go: rsc.io/needall@v0.0.1 requires go >= 1.23; switching to go1.23.9$'
! stderr '\(running'

# GOTOOLCHAIN=go1.21 should NOT run the newer toolchain
env GOTOOLCHAIN=go1.21

env GO111MODULE=on
env GOTRACEBACK=single

# Go 1.21 work module should leave panicnil with an implicit default.
cp go.mod.21 go.mod
go list -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}'
! stdout panicnil
stdout randautoseed=0

# Go 1.21 work module should NOT set panicnil=1 in Go 1.20 dependency.
cp go.mod.21 go.mod
go list -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}' q
! stdout panicnil=1
! stdout randautoseed

 *
 * <p>Consumer compatibility: This interface is used by all consumer versions from 2.1-rc-1.</p>
 * <p>Provider compatibility: This interface is implemented by all provider versions from 2.1-rc-1. Methods have different version compatibilities.</p>
 *
 * @since 2.1-rc-1
 * @see InternalParameterAcceptingConnection
 * @see org.gradle.tooling.internal.protocol.ConnectionVersion4
 */

echo module vcs-test.golang.org/git/tagtests.git >go.mod
echo package tagtests >tagtests.go
git add go.mod tagtests.go
git commit -m 'create module tagtests'

git branch b

echo v0.2.1 >v0.2.1
git add v0.2.1
git commit -m v0.2.1
git tag v0.2.1

git checkout b
echo v0.2.2 >v0.2.2
git add v0.2.2
git commit -m v0.2.2
git tag v0.2.2

git checkout master
git merge b -m merge

zip -r ../tagtests.zip .

// Lang returns the Go language version for version x.
// If x is not a valid version, Lang returns the empty string.
// For example:
//
//	Lang("go1.21rc2") = "go1.21"
//	Lang("go1.21.2") = "go1.21"
//	Lang("go1.21") = "go1.21"
//	Lang("go1") = "go1"
//	Lang("bad") = ""
//	Lang("1.21") = ""
func Lang(x string) string {
	v := lang(stripGo(x))
	if v == "" {
		return ""
	}