Add support for pattern alternatives #1627
Merged
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Addresses issues #1128 and #617 by adding support for pattern alternatives in Stainless.
This was done in the context of our project in the Formal Verification CS-550 course. This version adds a new Alternative pattern and handles it throughout the pipeline and therefore allows disjunctions of patterns to be used.
Note: This does not yet add support for pattern alternatives in the Coq encoder or GenC, but does include support for pattern alternatives when using the optional simplifiers OL and OCBSL.