Erase balances when delegatecall is seen

libsolidity/formal/BMC.cpp

@@ -591,6 +591,7 @@ void BMC::internalOrExternalFunctionCall(FunctionCall const& _funCall)
 	{
 		m_externalFunctionCallHappened = true;
 		resetStorageVariables();
+		resetBalances();
 	}
 }
 

libsolidity/formal/CHC.cpp

@@ -995,6 +995,7 @@ void CHC::resetContractAnalysis()
 void CHC::eraseKnowledge()
 {
 	resetStorageVariables();
+	resetBalances();
 }
 
 void CHC::clearIndices(ContractDefinition const* _contract, FunctionDefinition const* _function)

libsolidity/formal/SMTEncoder.cpp

@@ -2281,6 +2281,13 @@ void SMTEncoder::resetStorageVariables()
 	});
 }
 
+void SMTEncoder::resetBalances()
+{
+	// TODO this should be changed to `balances` only
+	// when `state` gets more members.
+	state().newState();
+}
+
 void SMTEncoder::resetReferences(VariableDeclaration const& _varDecl)
 {
 	m_context.resetVariables([&](VariableDeclaration const& _var) {

libsolidity/formal/SMTEncoder.h

@@ -303,6 +303,7 @@ protected:
 	void resetStateVariables();
 	void resetStorageVariables();
 	void resetMemoryVariables();
+	void resetBalances();
 	/// Resets all references/pointers that have the same type or have
 	/// a subexpression of the same type as _varDecl.
 	void resetReferences(VariableDeclaration const& _varDecl);