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9bb7ca6116
Add a new vet checker that rejects variables, parameters, named return values, receivers, range/type-switch bindings, type parameters, struct fields, and constants named "l" (lowercase ell) or "I" (uppercase i). Both are hard to distinguish from the digit "1" and from each other in too many fonts. Rename the two pre-existing struct fields named "l" (both of type net.Listener) in drive/driveimpl/drive_test.go to "ln", matching the convention used elsewhere for net.Listener locals. Rename the test-fixture struct fields "I" (single int label) to "Int" in metrics/multilabelmap_test.go and util/deephash/deephash_test.go, preserving the "first letters of types" convention used alongside neighboring fields like I8/I16/U/U8. Also teach pkgdoc_test.go to skip testdata/ directories, which the go tool ignores; they are not real packages. Fixes #19631 Change-Id: I71ad2fa990705f7a070406ebcdb8cefa7487d849 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>