ParenthesizedLambdaExpressions needs some work.

[belav]

        var task = Task.Factory.StartNew(async () =>  {
                return await new WebClient().DownloadStringTaskAsync(
                    "http://example.com"
                );
            });
// should probably be
        var task = Task.Factory.StartNew(async () =>
        {
            return await new WebClient().DownloadStringTaskAsync(
                "http://example.com"
            );
        });

[belav]

This got mostly resolved, so the only part left is to clean up the indentation.

[shocklateboy92]

You think something like this might look better? To make it clear that the braces aren't for the outer level statement, but rather the lambda being passed in?

        var task = Task.Factory.StartNew(async () =>
            {
                return await new WebClient().DownloadStringTaskAsync(
                    "http://example.com"
                );
            }
        );

[belav]

It actually formats really close to that now

        var task = Task.Factory.StartNew(
            async () =>
            {
                return await new WebClient().DownloadStringTaskAsync(
                    "http://example.comddddddddddddddddddd"
                );
            }
        );

Prettier formats it like this

var task = Task.Factory.StartNew(async () => {
    return await new WebClient().DownloadStringTaskAsync(
        "http://example.comddddddddddddddddddd"
    );
});

But I don't think we want to have the brace on the same line as =>

We could maybe move the ) up, which would be this, but I don't think I love that.

        var task = Task.Factory.StartNew(async () =>
            {
                return await new WebClient().DownloadStringTaskAsync(
                    "http://example.com"
                );
            });

Which leaves us with doing what you said

        var task = Task.Factory.StartNew(async () =>
            {
                return await new WebClient().DownloadStringTaskAsync(
                    "http://example.com"
                );
            }
        );

// however if there are multiple parameters

        var task = Task.Factory.StartNew(
            async () => 
            {
                return await new WebClient().DownloadStringTaskAsync(
                    "http://example.com"
                );
            },
            someOtherParameter
        );