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Returns

Klar requires explicit returns.

Even void functions must return explicitly.

void return​

Both forms work today:

return;

return null;

return null; is currently recommended by the project, but may be removed later to eliminate ambiguity.

Missing return example​

If you forget to return, Klar emits a semantic diagnostic.

Example (simplified):

[K:E205] MissingReturnStatement
ERROR (SEMANTIC)
...
Note:
  Even 'void' functions must return explicitly.

Important

Furthermore, only ONE function return is allowed and it MUST explicitly be located at the end of the function, that is, returns within the scope of control structures are not allowed.

Early returns cause an error.