Ada Programming/Aspects/No Return

Aspects No_Return __TOC__ with No_Return Description Specifying the aspect No_Return indicates that a procedure cannot return normally; it may raise an exception, loop forever, or terminate the program. A non-returning procedure may not contain any return statements. If a non-returning procedure implicitly returns (by reaching the end of its statement sequence), Program_Error will be raised at the point of call. On the call site, this enables detection of dead code and suppression of warnings about missing return statements or missing assignment to variables. Example procedure P ( … ) with No_Return; procedure Q (x : out … ) is begin if Cond then P ( … ); Some_Thing_Else; This is dead code--and due to No_Return probably a compiler warning! else x := … ; end if; No warning about a missing assignment to x here end Q; Portability The aspect No_Return was introduced in Ada 2012. It is the replacementAI05-0229 for pragma No_Return which was introduced in Ada 2005.AI95-00329 See also Wikibook Ada Programming Ada Programming/Aspects Ada Programming/Subprograms Ada Reference Manual 6 5 1 "Non Returning Procedures" References No_Return