=== RUN   TestScript/gotoolchain_loop
=== PAUSE TestScript/gotoolchain_loop
=== CONT  TestScript/gotoolchain_loop
    script_test.go:136: 2024-04-04T00:59:05Z
    script_test.go:138: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-1564537401/tmpdir2522228014/gotoolchain_loop2746227893
    script_test.go:160: 
        PATH=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-1564537401/tmpdir2522228014/testbin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/cache/tools/bin:/Users/swarming/.swarming/w/ir/bbagent_utility_packages:/Users/swarming/.swarming/w/ir/bbagent_utility_packages/bin:/Users/swarming/.swarming/w/ir/cipd_bin_packages:/Users/swarming/.swarming/w/ir/cipd_bin_packages/bin:/Users/swarming/.swarming/w/ir/cipd_bin_packages/cpython3:/Users/swarming/.swarming/w/ir/cipd_bin_packages/cpython3/bin:/Users/swarming/.swarming/w/ir/cache/cipd_client:/Users/swarming/.swarming/w/ir/cache/cipd_client/bin:/Users/swarming/.swarming/cipd_cache/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin
        HOME=/no-home
        CCACHE_DISABLE=1
        GOARCH=amd64
...
--- FAIL: TestScript/gotoolchain_loop (10.41s)
go proxy: no archive rsc.io/fortune/nonexist v0.0.1: file does not exist
go proxy: no archive rsc.io v0.0.1: file does not exist
go proxy: no archive rsc.io/fortune/nonexist v0.0.1: file does not exist
go proxy: no archive rsc.io v0.0.1: file does not exist
go proxy: no archive rsc.io/fortune/nonexist v0.0.1: file does not exist
go proxy: no archive rsc.io v0.0.1: file does not exist
go proxy: no archive rsc.io v0.0.1: file does not exist
go proxy: no archive rsc.io/fortune/nonexist v0.0.1: file does not exist
go proxy: no archive rsc.io/fortune/nonexist v0.0.1: file does not exist
go proxy: no archive rsc.io v0.0.1: file does not exist

=== RUN   TestScript/gotoolchain_loop
=== PAUSE TestScript/gotoolchain_loop
=== CONT  TestScript/gotoolchain_loop
    script_test.go:136: 2024-04-26T21:42:22Z
    script_test.go:138: $WORK=/Volumes/Work/s/w/ir/x/t/cmd-go-test-1297698536/tmpdir598516421/gotoolchain_loop493012610
    script_test.go:160: 
        PATH=/Volumes/Work/s/w/ir/x/t/cmd-go-test-1297698536/tmpdir598516421/testbin:/Volumes/Work/s/w/ir/x/w/goroot/bin:/Volumes/Work/s/w/ir/x/w/goroot/bin:/Volumes/Work/s/w/ir/x/w/goroot/bin:/Volumes/Work/s/w/ir/cache/tools/bin:/Volumes/Work/s/w/ir/bbagent_utility_packages:/Volumes/Work/s/w/ir/bbagent_utility_packages/bin:/Volumes/Work/s/w/ir/cipd_bin_packages:/Volumes/Work/s/w/ir/cipd_bin_packages/bin:/Volumes/Work/s/w/ir/cipd_bin_packages/cpython3:/Volumes/Work/s/w/ir/cipd_bin_packages/cpython3/bin:/Volumes/Work/s/w/ir/cache/cipd_client:/Volumes/Work/s/w/ir/cache/cipd_client/bin:/Volumes/Work/s/cipd_cache/bin:/opt/infra-tools:/opt/local/bin:/opt/local/sbin:/usr/local/sbin:/usr/local/git/bin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
        HOME=/no-home
        CCACHE_DISABLE=1
        GOARCH=arm64
...
        [exit status 1]
        > stderr '^go: toolchain go1.21.1 invoked to provide go1.21.99$'
        matched: go: toolchain go1.21.1 invoked to provide go1.21.99
        # Toolchain loop should be detected. (0.993s)
        > env TESTGO_VERSION_SWITCH=loop
        > ! go version
        [signal: illegal instruction]
        > stderr -count=10 '^go: switching from go1.21.1 to go1.21.99 \[depth 9[0-9]\]$'
    script_test.go:160: FAIL: testdata/script/gotoolchain_loop.txt:17: stderr -count=10 '^go: switching from go1.21.1 to go1.21.99 \[depth 9[0-9]\]$': found 0 matches for `(?m)^go: switching from go1.21.1 to go1.21.99 \[depth 9[0-9]\]$` in stderr
--- FAIL: TestScript/gotoolchain_loop (1.18s)