go version
stdout go1.21pre3

# GOTOOLCHAIN=go1.50.0
env GOTOOLCHAIN=go1.50.0
! go version
stderr 'running go1.50.0 from PATH'

# GOTOOLCHAIN=path with toolchain line
env GOTOOLCHAIN=local
go mod init m
go mod edit -toolchain=go1.50.0
grep go1.50.0 go.mod
env GOTOOLCHAIN=path
! go version
stderr 'running go1.50.0 from PATH'

# GOTOOLCHAIN=path with go line
env GOTOOLCHAIN=local

		//
		// Sends the first SIGSEGV and lets lldb catch the
		// second one, avoiding a loop that locks up iOS
		// devices requiring a hard reboot.
		fprintf(stderr, "runtime/cgo: caught exc_bad_access\n");
		fprintf(stderr, "__lr = %llx\n", thread_state.ts_64.__lr);
		fprintf(stderr, "__pc = %llx\n", thread_state.ts_64.__pc);
		static int pass1 = 0;
		if (pass1) {
			return KERN_FAILURE;
		}
		pass1 = 1;
	}

# (For now, exactly eight.)
! go list -m vcs-test.golang.org/auth/ormanylines@latest
stderr '\tserver response:\n(.|\n)*\tline 8\n\t\[Truncated: too many lines.\]$'

# Server responses should be truncated to some reasonable number of characters.
! go list -m vcs-test.golang.org/auth/oronelongline@latest
! stderr 'blah{40}'
stderr '\tserver response: \[Truncated: too long\.\]$'

go test -v -x ./x
stdout 'timeout: 24h0m0s$'
stderr '-test.count=1'

# Arguments from the command line should override GOFLAGS...
go test -v -x -timeout=25h0m0s ./x
stdout 'timeout: 25h0m0s$'
stderr '-test.count=1'

# ...even if they use a different flag name.
go test -v -x -test.timeout=26h0m0s ./x
stdout 'timeout: 26h0m0s$'
stderr '-test\.timeout=26h0m0s'
! stderr 'timeout=24h0m0s'
stderr '-test.count=1'

cd $WORK/x
exists x.go
go mod init
stderr 'module x'

# Import comment works even with CRLF line endings.
rm go.mod
replace '\n' '\r\n' x.go
go mod init
stderr 'module x'

# Derive module path from location inside GOPATH.
# 'go mod init' should succeed if modules are not explicitly disabled.
cd $GOPATH/src/example.com/x/y
go mod init
stderr 'module example.com/x/y$'
rm go.mod

! go build -x .
stderr '^go: creating work dir: \w+ '$GOTMPDIR

# 'go list' should only fail if it needs to build something.
go list -x .
! stderr 'creating work dir'
stdout m
go list -m all
stdout m
! go list -x -export .
stderr '^go: creating work dir: \w+ '$GOTMPDIR

# 'go clean -cache' and 'go clean -modcache' should not fail.
go clean -x -cache
! stderr 'creating work dir'
go clean -x -modcache

cp go.mod go.mod.orig

! go mod tidy

stderr '^go: example\.com/m imports\n\texample\.net/indirect imports\n\texample\.net/ambiguous/nested/pkg loaded from example\.net/ambiguous/nested@v0\.1\.0,\n\tbut go 1.16 would fail to locate it:\n\tambiguous import: found package example\.net/ambiguous/nested/pkg in multiple modules:\n\texample\.net/ambiguous v0.1.0 \(.*\)\n\texample\.net/ambiguous/nested v0.1.0 \(.*\)\n\n'

! go mod tidy
! stderr 'package nonexist is not in std'
stderr '^go: issue27063 imports\n\tnonexist.example.com: cannot find module providing package nonexist.example.com'
stderr '^go: issue27063 imports\n\tissue27063/other imports\n\tother.example.com/nonexist: cannot find module providing package other.example.com/nonexist'

! go mod vendor
! stderr 'package nonexist is not in std'

		log.Fatal(err)
	}

	r := bufio.NewReader(stderr)
	for {
		line, err := r.ReadString('\n')
		if line != "" {
			if strings.Contains(line, "clang version") {
				// Simulate a clang version string with an arbitrary vendor prefix.
				const vendorString = "Gopher Solutions Unlimited "
				os.Stderr.WriteString(vendorString)
			}
			os.Stderr.WriteString(line)
		}
		if err != nil {
			break
		}

go list -test -buildvcs=false .
! stderr .


# Since the ./testonly package doesn't itself produce an actual binary, we shouldn't
# invoke a VCS tool to compute a build stamp by default when listing it.
go list ./testonly
! stderr .
go list -test ./testonly
! stderr .

# Again, setting -buildvcs explicitly should force the use of the VCS tool.
! go list -buildvcs ./testonly