Exception handling in Ada has a number of well-known problems. It allows for the propagation of unhandled and anonymous exceptions, it is error-prone and it is inappropriate for some language features including tasking and tagged types. Ada programs with exceptions are difficult to understand, develop, modify or analyse, and the exception handling features can be misused in a number of ways. In...

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This paper introduces a new kind of local consistency based on the general idea of singleton arc consistency (SAC). This is a reduced form of SAC that only considers neighbourhoods of a variable with a singleton domain; hence, the name “neighbourhood SAC” (NSAC). Like AC and SAC, NSAC has a unique fixpoint, so that NSAC algorithms will produce the same result when applied to a problem regardles...