Abstract
Let's get started? In the beginning was created Ada. It did not have any assertions. Then came GNAT, which introduced pragma Assert. The ARG saw that it was good, and adopted it in Ada 2005. Then came GNAT again, which introduced pragma Precondition and pragma Postcondition. The ARG saw that they were good too, and adopted them as aspects in Ada 2012. The ARG even tried to beat GNAT at this game, and introduced at the same time aspects for type predicates (see Gems #146 and #147) and type invariants (see Gem #148), which are other forms of assertions. Then came GNAT again, introducing pragmas Assume, Assert_And_Cut, and Loop_Invariant, and aspect Contract_Cases, yet other forms of assertions.
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