Rationale for Ada 2012

John Barnes
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9.4.3 Global annotations

The idea here was that the specification of a subprogram should have annotations indicating the global objects that it might manipulate. For example a function can have side effects on global variables but this important matter is not mentioned in the specification. This topic has strong synergy with the information given in contracts such as pre- and postconditions. However, it was abandoned perhaps because of the complexity arising from the richness of the full Ada language. It should be noted that such annotations have always featured in SPARK as comments and moreover, at the time of writing, are being considered using the aspect notation in a new version of SPARK. (See AI-186).

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