cmd/go: TestSymlinkWarning failures

[gopherbot]

#!watchflakes
default <- pkg == "cmd/go" && test == "TestSymlinkWarning"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestSymlinkWarning
=== PAUSE TestSymlinkWarning
=== CONT  TestSymlinkWarning
    go_test.go:1371: running testgo [list example/xx/z...]
    go_test.go:1371: standard error:
    go_test.go:1371: go: warning: "example/xx/z..." matched no packages
        
    go_test.go:1376: running testgo [list example/xx/...]

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "cmd/go" && test == "TestSymlinkWarning"

2025-12-12 17:04 go1.26-darwin-amd64-race release-branch.go1.26@e8a83788 cmd/go.TestSymlinkWarning [SKIP] (log)

=== RUN   TestSymlinkWarning
=== PAUSE TestSymlinkWarning
=== CONT  TestSymlinkWarning
    go_test.go:1371: running testgo [list example/xx/z...]
    go_test.go:1371: standard error:
    go_test.go:1371: go: warning: "example/xx/z..." matched no packages
        
    go_test.go:1376: running testgo [list example/xx/...]

— watchflakes