Program: 27183
Project: 27183
Buggy source:
private boolean inlineAliasIfPossible(Name name,Ref alias,GlobalNamespace namespace){
  Node aliasParent=alias.node.getParent();
  if (aliasParent.isName() || aliasParent.isAssign()) {
    Node aliasLhsNode=aliasParent.isName() ? aliasParent : aliasParent.getFirstChild();
    String aliasVarName=aliasLhsNode.getString();
    Var aliasVar=alias.scope.getVar(aliasVarName);
    checkState(aliasVar != null,"String_Node_Str",aliasVarName);
    Node aliasDeclarationParent=aliasVar.getParentNode();
    Scope scope=aliasDeclarationParent.isVar() ? alias.scope.getClosestHoistScope() : alias.scope;
    ReferenceCollectingCallback collector=new ReferenceCollectingCallback(compiler,ReferenceCollectingCallback.DO_NOTHING_BEHAVIOR,new Es6SyntacticScopeCreator(compiler),Predicates.equalTo(aliasVar));
    collector.processScope(scope);
    ReferenceCollection aliasRefs=collector.getReferences(aliasVar);
    Set<AstChange> newNodes=new LinkedHashSet<>();
    if (aliasRefs.isWellDefined() && aliasRefs.firstReferenceIsAssigningDeclaration()) {
      if (!aliasRefs.isAssignedOnceInLifetime()) {
        if (name.isConstructor() && referencesCollapsibleProperty(aliasRefs,name,namespace)) {
          compiler.report(JSError.make(aliasParent,UNSAFE_CTOR_ALIASING,aliasVarName));
        }
        return false;
      }
      int size=aliasRefs.references.size();
      for (int i=1; i < size; i++) {
        Reference aliasRef=aliasRefs.references.get(i);
        newNodes.add(replaceAliasReference(alias,aliasRef));
      }
      aliasParent.replaceChild(alias.node,IR.nullNode());
      codeChanged=true;
      compiler.reportChangeToEnclosingScope(aliasParent);
      namespace.scanNewNodes(newNodes);
      return true;
    }
    if (name.isConstructor()) {
      return partiallyInlineAlias(alias,namespace,aliasRefs,aliasLhsNode);
    }
  }
  return false;
}

Fixed version (ground truth):
private boolean inlineAliasIfPossible(Name name,Ref alias,GlobalNamespace namespace){
  Node aliasParent=alias.node.getParent();
  if (aliasParent.isName() || aliasParent.isAssign()) {
    Node aliasLhsNode=aliasParent.isName() ? aliasParent : aliasParent.getFirstChild();
    String aliasVarName=aliasLhsNode.getString();
    Var aliasVar=alias.scope.getVar(aliasVarName);
    checkState(aliasVar != null,"String_Node_Str",aliasVarName);
    ReferenceCollectingCallback collector=new ReferenceCollectingCallback(compiler,ReferenceCollectingCallback.DO_NOTHING_BEHAVIOR,new Es6SyntacticScopeCreator(compiler),Predicates.equalTo(aliasVar));
    Scope aliasScope=aliasVar.getScope();
    collector.processScope(aliasScope);
    ReferenceCollection aliasRefs=collector.getReferences(aliasVar);
    Set<AstChange> newNodes=new LinkedHashSet<>();
    if (aliasRefs.isWellDefined() && aliasRefs.firstReferenceIsAssigningDeclaration()) {
      if (!aliasRefs.isAssignedOnceInLifetime()) {
        if (name.isConstructor() && referencesCollapsibleProperty(aliasRefs,name,namespace)) {
          compiler.report(JSError.make(aliasParent,UNSAFE_CTOR_ALIASING,aliasVarName));
        }
        return false;
      }
      int size=aliasRefs.references.size();
      for (int i=1; i < size; i++) {
        Reference aliasRef=aliasRefs.references.get(i);
        newNodes.add(replaceAliasReference(alias,aliasRef));
      }
      aliasParent.replaceChild(alias.node,IR.nullNode());
      codeChanged=true;
      compiler.reportChangeToEnclosingScope(aliasParent);
      namespace.scanNewNodes(newNodes);
      return true;
    }
    if (name.isConstructor()) {
      return partiallyInlineAlias(alias,namespace,aliasRefs,aliasLhsNode);
    }
  }
  return false;
}