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b39ee0445d
TestUsedConsistently shells out to git grep to find forbidden http.Method* uses across the repo. Since the test itself doesn't open any repo files, Go's test cache considers it unchanged between commits and serves stale passing results even when new violations are introduced. Fix by opening .git/index, which makes Go's test cache track it as an input. The index file changes on git reset, checkout, pull, etc., so the cache is properly invalidated when moving between commits. Updates tailscale/corp#40359 Change-Id: If1497b992a545351bdd68cff279d60f5591fe70b Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>