internal/coverage/cfile: TestIssue59563TruncatedCoverPkgAll failures

[gopherbot]

#!watchflakes
default <- pkg == "internal/coverage/cfile" && test == "TestIssue59563TruncatedCoverPkgAll"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestIssue59563TruncatedCoverPkgAll
    emitdata_test.go:506: go test -cover failed: exit status 1
        crypto/internal/fips140/aes/gcm: C:\b\s\w\ir\x\w\goroot\pkg\tool\windows_amd64\vet.exe: fork/exec C:\b\s\w\ir\x\w\goroot\pkg\tool\windows_amd64\vet.exe: The parameter is incorrect.
        PASS
        coverage: 8.9% of statements in all
        ok  	internal/coverage/cfile/testdata/issue59563	1.371s
--- FAIL: TestIssue59563TruncatedCoverPkgAll (35.50s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "internal/coverage/cfile" && test == "TestIssue59563TruncatedCoverPkgAll"

2025-04-04 21:00 gotip-windows-amd64-longtest go@7e60bdd7 internal/coverage/cfile.TestIssue59563TruncatedCoverPkgAll (log)

=== RUN   TestIssue59563TruncatedCoverPkgAll
    emitdata_test.go:506: go test -cover failed: exit status 1
        crypto/internal/fips140/aes/gcm: C:\b\s\w\ir\x\w\goroot\pkg\tool\windows_amd64\vet.exe: fork/exec C:\b\s\w\ir\x\w\goroot\pkg\tool\windows_amd64\vet.exe: The parameter is incorrect.
        PASS
        coverage: 8.9% of statements in all
        ok  	internal/coverage/cfile/testdata/issue59563	1.371s
--- FAIL: TestIssue59563TruncatedCoverPkgAll (35.50s)

— watchflakes