DistinctVarargsChecker
Method expects distinct arguments at some/all positions

The problem

Various methods which take variable-length arguments throw runtime exceptions like IllegalArgumentException when the arguments are not distinct.

This checker warns on using non-distinct parameters in various varargs methods when the usage is either redundant or will result in a runtime exception.

Bad:

ImmutableSet.of(first, second, second, third);

Good:

ImmutableSet.of(first, second, third);

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("DistinctVarargsChecker") to the enclosing element.