gistfile1.txt

System.AggregateException was unhandled
  HResult=-2146233088
  Message=One or more errors occurred.
  Source=mscorlib
  StackTrace:
       at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
       at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
       at System.Threading.Tasks.Task`1.get_Result()
       at ConsoleApplication1.Test.Execute() in D:\Github\Thesis\SourceCode\ThesisConsole\ConsoleApplication1\Test.cs:line 47
       at ConsoleApplication1.Program.Main(String[] args) in D:\Github\Thesis\SourceCode\ThesisConsole\ConsoleApplication1\Program.cs:line 18
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: 
       HResult=-2147467261
       Message=Object reference not set to an instance of an object.
       Source=Microsoft.CodeAnalysis.Workspaces
       StackTrace:
            at Microsoft.CodeAnalysis.Rename.RenameLocations.ReferenceProcessing.<GetRenamableDefinitionLocationsAsync>d__6.MoveNext()
         --- End of stack trace from previous location where exception was thrown ---
            at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
            at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
            at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
            at Microsoft.CodeAnalysis.Rename.RenameLocations.<AddLocationsReferenceSymbolsAsync>d__28.MoveNext()
         --- End of stack trace from previous location where exception was thrown ---
            at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
            at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
            at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
            at Microsoft.CodeAnalysis.Rename.RenameLocations.<FindAsync>d__24.MoveNext()
         --- End of stack trace from previous location where exception was thrown ---
            at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
            at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
            at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
            at Microsoft.CodeAnalysis.Rename.Renamer.<RenameSymbolAsync>d__3.MoveNext()
       InnerException: 

gistfile2.txt

?symbol
Local System.Int32[missing] o
    CanBeReferencedByName: true
    CanBeReferencedByNameIgnoringIllegalCharacters: true
    CanScheduleToStack: true
    ConstantValue: null
    ContainingAssembly: Assembly projName, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null
    ContainingModule: NetModule projName.exe
    ContainingNamespace: Namespace ConsoleApplication1
    ContainingSymbol: Method void ConsoleApplication1.MyClass.Method()
    ContainingType: NamedType ConsoleApplication1.MyClass
    Dangerous_IsFromSomeCompilation: true
    DeclarationKind: RegularVariable
    DeclaredAccessibility: NotApplicable
    DeclaringCompilation: {Microsoft.CodeAnalysis.CSharp.CSharpCompilation}
    DeclaringSyntaxReferences: Length = 1
    HasConstantValue: false
    HasUnsupportedMetadata: false
    HasUseSiteError: false
    HighestPriorityUseSiteError: 2147483647
    IdentifierToken: SyntaxToken IdentifierToken o
    IsAbstract: false
    IsCatch: false
    IsCompilerGenerated: false
    IsConst: false
    IsDefinition: true
    IsExtern: false
    IsFixed: false
    IsFor: false
    IsForEach: false
    IsImplicitlyDeclared: false
    IsImportedFromMetadata: false
    IsOverride: false
    IsPinned: false
    IsSealed: false
    IsStatic: false
    IsUsing: false
    IsVar: false
    IsVirtual: false
    IsWritable: true
    Kind: Local
    Language: "C#"
    Locations: Length = 1
    MetadataName: "o"
    Microsoft.CodeAnalysis.ILocalSymbol.IsFunctionValue: false
    Microsoft.CodeAnalysis.ILocalSymbol.Type: ErrorType System.Int32[missing]
    Microsoft.CodeAnalysis.ILocalSymbolInternal.IsImportedFromMetadata: false
    Microsoft.CodeAnalysis.ILocalSymbolInternal.SynthesizedKind: UserDefined
    Microsoft.CodeAnalysis.ISymbol.ContainingAssembly: Assembly projName, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null
    Microsoft.CodeAnalysis.ISymbol.ContainingModule: NetModule projName.exe
    Microsoft.CodeAnalysis.ISymbol.ContainingNamespace: Namespace ConsoleApplication1
    Microsoft.CodeAnalysis.ISymbol.ContainingSymbol: Method void ConsoleApplication1.MyClass.Method()
    Microsoft.CodeAnalysis.ISymbol.ContainingType: NamedType ConsoleApplication1.MyClass
    Microsoft.CodeAnalysis.ISymbol.DeclaredAccessibility: NotApplicable
    Microsoft.CodeAnalysis.ISymbol.DeclaringSyntaxReferences: Length = 1
    Microsoft.CodeAnalysis.ISymbol.IsAbstract: false
    Microsoft.CodeAnalysis.ISymbol.IsDefinition: true
    Microsoft.CodeAnalysis.ISymbol.IsImplicitlyDeclared: false
    Microsoft.CodeAnalysis.ISymbol.IsOverride: false
    Microsoft.CodeAnalysis.ISymbol.IsSealed: false
    Microsoft.CodeAnalysis.ISymbol.IsStatic: false
    Microsoft.CodeAnalysis.ISymbol.IsVirtual: false
    Microsoft.CodeAnalysis.ISymbol.Kind: Local
    Microsoft.CodeAnalysis.ISymbol.Locations: Length = 1
    Microsoft.CodeAnalysis.ISymbol.Name: "o"
    Microsoft.CodeAnalysis.ISymbol.OriginalDefinition: Local System.Int32[missing] o
    Name: "o"
    ObsoleteAttributeData: null
    ObsoleteState: False
    OriginalDefinition: Local System.Int32[missing] o
    OriginalSymbolDefinition: Local System.Int32[missing] o
    RefKind: None
    RequiresCompletion: false
    SynthesizedKind: UserDefined
    Type: ErrorType System.Int32[missing]
    _constantTuple: null
    _containingSymbol: Method void ConsoleApplication1.MyClass.Method()
    _declarationKind: RegularVariable
    _identifierToken: SyntaxToken IdentifierToken o
    _initializer: EqualsValueClauseSyntax EqualsValueClause = 5
    _isSpecificallyNotPinned: 0
    _locations: Length = 1
    _type: ErrorType System.Int32[missing]
    _typeSyntax: PredefinedTypeSyntax PredefinedType int
    binder: {Microsoft.CodeAnalysis.CSharp.BlockBinder}

weird.cs

internal static void Execute()
{
    var source = @"
using System;
using System.Text;

namespace ConsoleApplication1
{
class MyClass
{
private int oAsInt32;

void Method()
{
    int o = 5;
    Console.WriteLine(oAsInt32);
}
}
}";

    var workspace = new AdhocWorkspace();
    var projectId = ProjectId.CreateNewId();
    var project = workspace.AddProject(ProjectInfo.Create(projectId, VersionStamp.Create(), "NewProject", "projName", LanguageNames.CSharp));
    var document = workspace.AddDocument(project.Id, "NewFile.cs", SourceText.From(source));
    var root = document.GetSyntaxRootAsync().Result;
    var editor = DocumentEditor.CreateAsync(document).Result;
    var semanticModel = document.GetSemanticModelAsync().Result;

    var localIdentifier = root.DescendantNodes().OfType<VariableDeclaratorSyntax>().Skip(1).First();
    var symbol = semanticModel.GetDeclaredSymbol(localIdentifier);

    var renamedSolution = Renamer.RenameSymbolAsync(project.Solution, symbol, "oAsInt32", null).Result;

    Console.WriteLine(renamedSolution.GetProject(projectId).GetDocument(document.Id).GetTextAsync().Result);
}