"Failed to parse tasks.json file" with OS specific closure

[kriwar]

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:     Windows
 OS Version:  10.0.14393
 OS Platform: Windows
 RID:         win10-x64

VS Code version: 1.8.1
C# Extension version: 1.6.2

Steps to reproduce

$ git clone git@github.com:kriwar/dotnetcore-helloworld.git

Open project in VS Code.

Notice the Windows specific closure in https://github.com/kriwar/dotnetcore-helloworld/blob/master/.vscode/tasks.json#L3, if this enclosing statement is removed, things work just fine.

The project works despite the error message, I can run tasks from the VS Code Command Palette without problems.

Expected behavior

Project opens without errors or warnings.

Actual behavior

Error prompt Failed to parse tasks.json file. Follow-up Warn Required assets to build and debug are missing... (I believe this is a follow-on to the error displayed first).

As far as I've been able to tell, this behavior started with v1.6.2 of OmniSharp, error message is emitted from https://github.com/OmniSharp/omnisharp-vscode/blob/master/src/assets.ts#L367