NumberFormatException when Enabling Counterexamples

[ArquintL]

The following program results in a NumberFormatException as Silicon seems to try to parse Tuple2< as a BigInt.

• Silicon commit ea0efee
• command java -jar -Xss128m ./target/scala-2.13/silicon.jar example.vpr --counterexample mapped --enableMoreCompleteExhale

example.vpr.zip