VSTHRD002UseJtfRunAnalyzer throws for 'Task.WhenAll(task).Result'

[ArturDorochowicz]

Bug description

VSTHRD002UseJtfRunAnalyzer throws for the following code:

var task = Task.Run(async () => {
    await Task.Delay(0).ConfigureAwait(false);
    return 0;
});
_ = Task.WhenAll(task).Result;

The exception is:

CSC : warning AD0001: Analyzer 'Microsoft.VisualStudio.Threading.Analyzers.VSTHRD002UseJtfRunAnalyzer'
threw an exception of type 'System.Exception' with message 'Analyzer failure while processing syntax at [...]:
System.InvalidCastException Unable to cast object of type 'Microsoft.CodeAnalysis.CSharp.Syntax.InvocationExpressionSyntax' 
to type 'Microsoft.CodeAnalysis.CSharp.Syntax.IdentifierNameSyntax'.. Syntax: Task.WhenAll(task).Result'. 

Repro steps

Code to reproduce the behavior.

1. dotnet new console
2. dotnet add package Microsoft.VisualStudio.Threading -v 17.0.63
3. Replace Program.cs with the following and run dotnet build

using System;
using System.Threading.Tasks;

namespace vsthreading
{
    class Program
    {
        static void Main(string[] args)
        {
            var task = Task.Run(async () => {
                await Task.Delay(0).ConfigureAwait(false);
                return 0;
            });
            _ = Task.WhenAll(task).Result;
        }
    }
}

Expected behavior

The analyzer should not throw.

Actual behavior

The analyzer throws an exception.

• Version used: 17.0.63
• Application (if applicable): N/A

Additional context

N/A