env GOTOOLCHAIN=go1.22.9
! go work use ./m1_24_rc0
stderr '^go: m1_24_rc0'${/}'go.mod requires go >= 1.24rc0 \(running go 1.22.9; GOTOOLCHAIN=go1.22.9\)$'
env GOTOOLCHAIN=auto
go work use ./m1_24_rc0
stderr '^go: m1_24_rc0'${/}'go.mod requires go >= 1.24rc0; switching to go1.24rc1$'
grep '^go 1.24rc0$' go.work

grep '^toolchain go1.22.9$' go.work

# work sync with newer modules should update go 1.22.1 -> 1.24rc1 and drop toolchain
go work edit -use=./m1_24_rc0
go work sync
stderr '^go: m1_24_rc0'${/}'go.mod requires go >= 1.24rc0; switching to go1.24rc1$'
cat go.work
grep '^go 1.24rc0$' go.work

golang.org/toolchain v0.0.1-go1.24rc1.linux-amd64
written by hand
-- .info --
{"Version":"v0.0.1-go1.24rc1.linux-amd64"}
-- .mod --
golang.org/toolchain
-- go.mod --

cp go.mod.orig go.mod
! go get go@1.24
stderr '^go: go@1.24: no matching versions for query "1.24"$'

# go get go@1.24rc1 works
cp go.mod.orig go.mod
go get go@1.24rc1
stderr '^go: upgraded go 1.21 => 1.24rc1$'
grep 'go 1.24rc1' go.mod
grep 'toolchain go1.99rc1' go.mod

# go get go@latest finds the latest Go 1.23
cp go.mod.orig go.mod
go get go@latest

# The -C flag should not happen more than once due to switching.
mkdir dir dir/dir
cp go.mod.new go.mod
cp go.mod.new dir/go.mod
cp go.mod.new dir/dir/go.mod
cp p.go dir/p.go
cp p.go dir/dir/p.go
go get -C dir rsc.io/needgo124
stderr '^go: rsc.io/needgo124@v0.0.1 requires go >= 1.24; switching to go1.24rc1$'
stderr '^go: upgraded go 1.1 => 1.24$'
stderr '^go: added toolchain go1.24rc1$'

	{"1.21", Version{"1", "21", "", "", ""}},
	{"1.21rc3", Version{"1", "21", "", "rc", "3"}},
	{"1.21.0", Version{"1", "21", "0", "", ""}},
	{"1.24", Version{"1", "24", "", "", ""}},
	{"1.24rc3", Version{"1", "24", "", "rc", "3"}},
	{"1.24.0", Version{"1", "24", "0", "", ""}},
	{"1.999testmod", Version{"1", "999", "", "testmod", ""}},
	{"1.99999999999999999", Version{"1", "99999999999999999", "", "", ""}},
}