implies

Specifies that this effect, when observed, guarantees booleanExpression to be true.

Note: booleanExpression can accept only a subset of boolean expressions, where a function parameter or receiver (this) undergoes

• true of false checks, in case if the parameter or receiver is Boolean;
• null-checks (== null, != null);
• instance-checks (is, !is);
• a combination of the above with the help of logic operators (&&, ||, !).