Syntax highlighter broken on line with class inside string

[swhaworth]

Environment data

dotnet --info output:
.NET Command Line Tools (1.0.0-preview2-003121)

Product Information:
Version: 1.0.0-preview2-003121
Commit SHA-1 hash: 1e9d529bc5

Runtime Environment:
OS Name: debian
OS Version: 8
OS Platform: Linux
RID: debian.8-x64

VS Code version: 1.4.0
C# Extension version: 1.4.1

Steps to reproduce

Create a new CS file, paste in the following content:

namespace X
{
    class Y
    {
        public MethodZ()
        {
            this.Writer.WriteLine("class CInput{0}Register : public {1}", index, baseClass);
        }
    }
}

Expected behavior

Syntax highlighting will set the string content as a single colour and after the string the highlighting will have correct colours for the variable names, etc.

Actual behavior

The string content is using standard C# highlighting for class etc and goes back to the inside string highlighting after the second quote.

This used to work fine prior to C# extension version 1.4.0.

[DustinCampbell]

This will look much better in the next release: