# go get go should use the latest Go 1.23
cp go.mod.orig go.mod
go get go
stderr '^go: upgraded go 1.21 => 1.23.9$'
grep 'go 1.23.9' go.mod
grep 'toolchain go1.99rc1' go.mod

# go get go@1.23 should use the latest Go 1.23
cp go.mod.orig go.mod
go get go@1.23
stderr '^go: upgraded go 1.21 => 1.23.9$'
grep 'go 1.23.9' go.mod
grep 'toolchain go1.99rc1' go.mod

# go get go@1.22 should use the latest Go 1.22

cp $devnull go.mod # can't use touch to create it because Windows
! go mod init
stderr 'go.mod already exists'

# Module path from Godeps/Godeps.json overrides GOPATH.
cd $GOPATH/src/example.com/x/y/z
go mod init
stderr 'unexpected.com/z'
rm go.mod

# Empty directory outside GOPATH fails.
mkdir $WORK/empty
cd $WORK/empty
! go mod init
stderr 'cannot determine module path for source directory'

DATA ·IEEEConst+208(SB)/8,$0x00000001b5334592
DATA ·IEEEConst+216(SB)/8,$0x00000001f8cc6582

	/* x^246848 mod p(x), x^246784 mod p(x) */
DATA ·IEEEConst+224(SB)/8,$0x000000011f8ee1b4
DATA ·IEEEConst+232(SB)/8,$0x000000008631ddf0

	/* x^245824 mod p(x), x^245760 mod p(x) */
DATA ·IEEEConst+240(SB)/8,$0x000000006252e632
DATA ·IEEEConst+248(SB)/8,$0x000000007e5a76d0

	/* x^244800 mod p(x), x^244736 mod p(x) */

go mod edit -json $WORK/go.mod.deprecation
cmp stdout $WORK/go.mod.deprecation.json

# go mod edit -json (empty mod file)
go mod edit -json $WORK/go.mod.empty
cmp stdout $WORK/go.mod.empty.json

# go mod edit -replace
go mod edit -replace=x.1@v1.3.0=y.1/v2@v2.3.5 -replace=x.1@v1.4.0=y.1/v2@v2.3.5
cmpenv go.mod $WORK/go.mod.edit3
go mod edit -replace=x.1=y.1/v2@v2.3.6
cmpenv go.mod $WORK/go.mod.edit4
go mod edit -dropreplace=x.1

# other 'go mod' commands should work. 'go mod vendor' is tested later.
go mod download rsc.io/quote
go mod graph
stdout rsc.io/quote
go mod tidy
grep rsc.io/quote go.alt.sum
go mod verify
go mod why rsc.io/quote


# 'go list' and other commands with build flags should work.
# They should update the alternate go.mod when a dependency is missing.
go mod edit -droprequire rsc.io/quote
go list -mod=mod .

github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
github.com/google/go-cmp v0.5.7/go.mod h1:n+brtR0CgQNWTVd5ZUFpTBC8YFBDLK/h/bpaJ8/DtOE=

! stderr '\n\tgo mod tidy'

cmp go.mod go.mod.tidy

# Make sure that -diff behaves the same as tidy.
[exec:patch] cp go.mod go.mod.tidyResult
[exec:patch] ! exists go.sum
[exec:patch] cp go.mod.orig go.mod
[exec:patch] ! go mod tidy -e -diff
[exec:patch] stdout 'diff current/go.mod tidy/go.mod'

golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=

go mod tidy -compat=1.17
! stderr .
cmp go.mod go.mod.orig

# Make sure that -diff behaves the same as tidy.
[exec:patch] mv go.mod go.mod.tidyResult
[exec:patch] mv go.sum go.sum.tidyResult
[exec:patch] cp go.mod.orig go.mod
[exec:patch] ! go mod tidy -compat=1.17 -diff
[exec:patch] cp stdout diff.patch
[exec:patch] exec patch -p1 -i diff.patch
[exec:patch] go mod tidy -compat=1.17 -diff
[exec:patch] ! stdout .

# but can appear in the main go.mod file anyway and should be resolved.
cp go.mod.orig go.mod
go mod edit -require golang.org/x/text@14c0d48ead0c
cd outside
! go list -m golang.org/x/text
stderr 'go: example.com@v0.0.0 \(replaced by \./\.\.\): parsing ..[/\\]go.mod: '$WORK'[/\\]gopath[/\\]src[/\\]go.mod:5: require golang.org/x/text: version "14c0d48ead0c" invalid: must be of the form v1.2.3'
cd ..