Reliable way to lock up vscode

[NinoFloris]

Environment data

dotnet --info output:
.NET Command Line Tools (1.0.0-preview2-1-003177)

Product Information:
Version: 1.0.0-preview2-1-003177
Commit SHA-1 hash: a2df9c2576

Runtime Environment:
OS Name: Mac OS X
OS Version: 10.11
OS Platform: Darwin
RID: osx.10.11-x64
VS Code version:
1.8.1
C# Extension version:
1.6.1

Steps to reproduce

Set file to C# and paste this in, next try to add any generic type to the int on _totalLockup.

using System;
using System.Collections.Generic;

public class Bizarre 
{
    // Typing X< (say List<) before x (int here) works fine when TKey is not RuntimeTypeHandle
    private Dictionary<Type, int> _worksFine;

    // With RuntimeTypeHandle this fully locks up VSCode until it shows the 'window unresponsive' dialog
    private Dictionary<RuntimeTypeHandle, int> _totalLockup;
}

See tweet for repro https://twitter.com/NinoFloris/status/812838424545783808

[DustinCampbell]

This looks like a duplicate of #1086.

[DustinCampbell]

OK. All of my analysis is in #1086. I'm closing this as a dupe of this issue. However, thanks very much for your excellent repro. I've pushed a new release (1.6.2) that should address this problem. It's not a perfect solution, but it won't hang any longer. If you're interested in seeing what happened, check out issue #1086 and the PR I merged to workaround it: #1089.