using System;

using System.Linq;

using Microsoft.CodeAnalysis.CSharp;

using Microsoft.CodeAnalysis;

using Microsoft.CodeAnalysis.CSharp.Syntax;

​

var tree = CSharpSyntaxTree.ParseText(@"

bool a = 3 > 5;

namespace System{

    public struct Int32

    {

        public static extern bool operator > (int a, int b);

    }

    public struct Boolean { }

}");

var compilation = CSharpCompilation.Create("bla").AddSyntaxTrees(tree);

var model = compilation.GetSemanticModel(tree);

​

var usedSymbol     = model.GetSymbolInfo(tree.GetRoot().DescendantNodes().OfType<BinaryExpressionSyntax>().Single()).Symbol;

var declaredSymbol = model.GetDeclaredSymbol(tree.GetRoot().DescendantNodes().OfType<OperatorDeclarationSyntax>().Single());

​

Console.WriteLine(

    $"{declaredSymbol} and {usedSymbol} are {(declaredSymbol.Equals(usedSymbol) ? "" : "not ")}equal.");