nodes with failed obligations are always explicit assumptions

Author: AndreaKe

src/main/scala/dependencyAnalysis/DependencyAnalyzer.scala

@@ -359,8 +359,11 @@ class DefaultDependencyAnalyzer(member: ast.Member) extends DependencyAnalyzer {
   }
 
   override def addAssertionFailedNode(failedAssertion: Term, assertionType: AssumptionType, sourceInfo: AnalysisSourceInfo): Option[Int] = {
+    val assumeNode = SimpleAssumptionNode(failedAssertion, None, sourceInfo, AssumptionType.Explicit, isClosed=false, isJoinNode=false)
     val assertFailedNode = SimpleAssertionNode(failedAssertion, assertionType, sourceInfo, isClosed=false, hasFailed=true)
+    dependencyGraph.addNode(assumeNode)
     dependencyGraph.addNode(assertFailedNode)
+    dependencyGraph.addEdges(Set(assumeNode.id), assertFailedNode.id)
     Some(assertFailedNode.id)
   }