Boolean algebra implication.
Tests whether the given set contains this value as an element
Tests whether the given set contains this value as an element
Tests whether the given sequence contains this value as an element
Tests whether the given sequence contains this value as an element
chained syntax for if(bool) Some(value) else None
Tests whether the given set does NOT contains this value as an element
Tests whether the given set does NOT contains this value as an element
Tests whether the given sequence does NOT contains this value as an element
Tests whether the given sequence does NOT contains this value as an element
returns Some of given value if left hand side is true, else None
Boolean algebra xor.