File: SelfAssignment.md

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The left-hand side and right-hand side of this assignment are the same. It has
no effect.

This also handles assignments in which the right-hand side is a call to
Preconditions.checkNotNull(), which returns the variable that was checked for
non-nullity. If you just intended to check that the variable is non-null, please
don't assign the result to the checked variable; just call
Preconditions.checkNotNull() as a bare statement.