prettier: Hang formatting nested functions

Hey, I just found that prettier hangs when formatting this:

someObject.someFunction().then(function () {
    return someObject.someFunction().then(function () {
        return someObject.someFunction().then(function () {
            return someObject.someFunction().then(function () {
                return someObject.someFunction().then(function () {
                    return someObject.someFunction().then(function () {
                        return someObject.someFunction().then(function () {
                            return someObject.someFunction().then(function () {
                                return someObject.someFunction().then(function () {
                                    anotherFunction();
                                });
                            });
                        });
                    });
                });
            });
        });
    });
});

(I’m embarrassed to have this piece of code in a codebase, it’s because of a limitation of a third-party library 😄)

If I remove two of the innermost nested calls, prettier does end and format correctly (it takes a while, though). So it seems that it’s not a hang but rather just taking exponentially forever when dealing with this (messed up) code.

I’m running prettier 1.0.2 on macOS 10.12.4 through the CLI: prettier file.js

Thanks