cmd/go: "undefined: testing.InternalFuzzTarget" when attempting to build minimal test package (on tip)

[mark-rushakoff]

What version of Go are you using (go version)?

$ go version
go version devel go1.19-41fe746857 Mon Mar 14 18:03:37 2022 +0000 darwin/amd64

Does this issue reproduce with the latest release?

No.

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/hh/Library/Caches/go-build"
GOENV="/Users/hh/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/hh/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/hh/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/Cellar/go/1.17.8/libexec"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.17.8/libexec/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="devel go1.19-41fe746857 Mon Mar 14 18:03:37 2022 +0000"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/tmp/z/go.mod"
GOWORK=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/_m/h25_32y958gbgk67m97141400000gq/T/go-build562485514=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

I wrote a minimal test file:

package z_test

import "testing"

func TestZ(t *testing.T) {
}

and a minimal go.mod:

module z

go 1.17

Running go test fails:

What did you expect to see?

$ go test .
ok  	z	0.180s

What did you see instead?

$ gotip test .
# z.test
/var/folders/_m/h25_32y958gbgk67m97141400000gq/T/go-build396096674/b001/_testmain.go:29:21: undefined: testing.InternalFuzzTarget
/var/folders/_m/h25_32y958gbgk67m97141400000gq/T/go-build396096674/b001/_testmain.go:45:24: too many arguments in call to testing.MainStart
FAIL	z [build failed]
FAIL

I also ran with -x in case that is helpful:

gotip test -x output

gotip test -x .
WORK=/var/folders/_m/h25_32y958gbgk67m97141400000gq/T/go-build1267485252
mkdir -p $WORK/b001/
mkdir -p $WORK/b006/
mkdir -p $WORK/b030/
mkdir -p $WORK/b016/
mkdir -p $WORK/b015/
mkdir -p $WORK/b036/
mkdir -p $WORK/b012/
mkdir -p $WORK/b034/
mkdir -p $WORK/b014/
mkdir -p $WORK/b021/
mkdir -p $WORK/b011/
mkdir -p $WORK/b009/
mkdir -p $WORK/b010/
mkdir -p $WORK/b013/
mkdir -p $WORK/b022/
mkdir -p $WORK/b033/
mkdir -p $WORK/b008/
mkdir -p $WORK/b005/
mkdir -p $WORK/b020/
mkdir -p $WORK/b004/
mkdir -p $WORK/b027/
mkdir -p $WORK/b043/
mkdir -p $WORK/b019/
mkdir -p $WORK/b029/
mkdir -p $WORK/b044/
mkdir -p $WORK/b017/
mkdir -p $WORK/b031/
mkdir -p $WORK/b035/
mkdir -p $WORK/b038/
mkdir -p $WORK/b042/
mkdir -p $WORK/b032/
mkdir -p $WORK/b023/
mkdir -p $WORK/b041/
mkdir -p $WORK/b025/
mkdir -p $WORK/b026/
mkdir -p $WORK/b024/
mkdir -p $WORK/b047/
mkdir -p $WORK/b028/
mkdir -p $WORK/b018/
mkdir -p $WORK/b003/
mkdir -p $WORK/b045/
mkdir -p $WORK/b040/
mkdir -p $WORK/b039/
mkdir -p $WORK/b046/
mkdir -p $WORK/b037/
mkdir -p $WORK/b059/
cat >$WORK/b001/importcfg << 'EOF' # internal
# import config
packagefile os=/Users/hh/Library/Caches/go-build/31/3142f0a4fa2248001fa6c3b95fe3ff420011ebe1cbc48d531830a6fbb6ada0f6-d
packagefile reflect=/Users/hh/Library/Caches/go-build/09/09f2184a164458f862dc15c0a13006bea12c31a35efb6b0920d30cd22aecedc3-d
packagefile testing=/Users/hh/Library/Caches/go-build/31/3126f1b99685a140a77b8d98cd47e5d89a589bc5ab0e7263265234f76d4c8a65-d
packagefile testing/internal/testdeps=/Users/hh/Library/Caches/go-build/70/709c2fbe97ebc860a78b7cdb18d8f0ef4959d7105933b8f137ee104ff21d3b5a-d
packagefile runtime=/Users/hh/Library/Caches/go-build/b6/b6495d6d4bd290c135fa21eab02252b68be2a8f63f256c5f6ff2b19410e96f3e-d
packagefile z_test=/Users/hh/Library/Caches/go-build/c9/c9db00b33350ccbd26a1a0c1f8b6cd72e6b2badc63533877b04d7a6f3810d61a-d
EOF
cd /tmp/z
/usr/local/Cellar/go/1.17.8/libexec/pkg/tool/darwin_amd64/compile -o $WORK/b001/_pkg_.a -trimpath "$WORK/b001=>" -p main -lang=go1.17 -complete -buildid 5glPu2yppA15mVXKI1_G/5glPu2yppA15mVXKI1_G -dwarf=false -c=4 -nolocalimports -importcfg $WORK/b001/importcfg -pack $WORK/b001/_testmain.go
cat >$WORK/b059/vet.cfg << 'EOF' # internal
{
	"ID": "z_test",
	"Compiler": "gc",
	"Dir": "/tmp/z",
	"ImportPath": "z_test",
	"GoFiles": [
		"/tmp/z/z_test.go"
	],
	"NonGoFiles": [],
	"IgnoredFiles": [],
	"ImportMap": {
		"testing": "testing"
	},
	"PackageFile": {
		"testing": "/Users/hh/Library/Caches/go-build/31/3126f1b99685a140a77b8d98cd47e5d89a589bc5ab0e7263265234f76d4c8a65-d"
	},
	"Standard": {
		"testing": true
	},
	"PackageVetx": {
		"testing": "/Users/hh/Library/Caches/go-build/9c/9c1171cfe176cfdc7d7a0a718b2d6dc53a1b328b81756d9191df1dfccc2268a9-d"
	},
	"VetxOnly": false,
	"VetxOutput": "$WORK/b059/vet.out",
	"SucceedOnTypecheckFailure": false
}
EOF
TERM='dumb' /usr/local/Cellar/go/1.17.8/libexec/pkg/tool/darwin_amd64/vet -atomic -bool -buildtags -errorsas -ifaceassert -nilfunc -printf -stringintconv $WORK/b059/vet.cfg
# z.test
/var/folders/_m/h25_32y958gbgk67m97141400000gq/T/go-build1267485252/b001/_testmain.go:29:21: undefined: testing.InternalFuzzTarget
/var/folders/_m/h25_32y958gbgk67m97141400000gq/T/go-build1267485252/b001/_testmain.go:45:24: too many arguments in call to testing.MainStart
rm -r $WORK/b001/
FAIL	z [build failed]
FAIL

[seankhliao]

do you have an explicit GOROOT setting?
the go command is tip, but it's using a 1.17.8 root installed with brew

[mark-rushakoff]

Thanks @seankhliao, that was it. This is a new user account on an existing machine, and I did not intend for GOROOT to be set; but after running unset GOROOT, I was able to run tests with gotip properly.