any-duplicated

Flag any(duplicated(x)), which is the purpose-built anyDuplicated(x) > 0 — faster (it short-circuits and builds no intermediate logical vector) and clearer.

The rule fires only on the clean single-argument shape and only when both any and duplicated resolve to base R; a local redefinition of either is left alone. Because the replacement is a comparison, the fix is withheld in a context that binds tighter than a comparison, where the bare rewrite would need parentheses.

Testing for any duplicate value:

if (any(duplicated(x))) stop()

warning: any-duplicated
 --> example.R:1:5
  |
1 | if (any(duplicated(x))) stop()
  |     ^^^^^^^^^^^^^^^^^^ `any(duplicated(x))` is the faster, clearer `anyDuplicated(x) > 0`
  = help: Use `anyDuplicated(x) > 0`.

After applying the fix:

if (anyDuplicated(x) > 0) stop()