gistfile1.cs

var tree = CSharpSyntaxTree.ParseText(@"
    class MyClass
    {
        int myField = 0;
        public int MyProperty {get; set;}
        public void MyMethod() { }
    }");

var Mscorlib = PortableExecutableReference.CreateFromAssembly(typeof(object).Assembly);
var compilation = CSharpCompilation.Create("MyCompilation",
    syntaxTrees: new[] { tree }, references: new[] { Mscorlib });
var model = compilation.GetSemanticModel(tree);

//Get declarations
var property = tree.GetRoot().DescendantNodes().OfType<PropertyDeclarationSyntax>().Single();
var method = tree.GetRoot().DescendantNodes().OfType<PropertyDeclarationSyntax>().Single();
var field = tree.GetRoot().DescendantNodes().OfType<FieldDeclarationSyntax>().Single();
//Get symbols
var propertySymbol = model.GetDeclaredSymbol(property);
var methodSymbol = model.GetDeclaredSymbol(method);
var fieldSymbol = model.GetDeclaredSymbol(field);

Hi @JoshVarty,
Line no. 16 should have MethodDeclarationSyntax instead of PropertyDeclarationSyntax

Cheers,
Vikas