When a function parameter has a nullable type, e.g., parameter ``++param++`` in ``++f(?int param)++``, it must be explicitly provided in every function call. A nullable-type parameter has no default value.


== Noncompliant Code Example

----
function f(?int param) {}
f();
----


== Compliant Solution

----
function f(?int param) {}
f(0);
----



ifdef::env-github,rspecator-view[]
'''
== Comments And Links
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include::comments-and-links.adoc[]
endif::env-github,rspecator-view[]