Use split attributes boogaloo #1386
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…perSniper/dafny into use-split-attributes-boogaloo
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Rather than merge with master, I reimplement on top of it. The PR also updates boogie version
Split attribute "semantics". Statements
calc,forall, andassert-byare thought to have thesplitattribute by default.When Dafny sees a
splitattribute, it instructs Boogie (usingsplit_hereassertions) to check the statement separately. For example, one could usespliton a while statement to check thebodyandinvariantsindependently from rest of the code.