incorrect new-line insertion after "yield"

[kotarondo]

Description

I got syntax error after js-beautify.

Input

The code looked like this before beautification:

function* gen() {
    yield function() {};
}

Expected Output

No change.

Actual Output

The code actually looked like this after beautification:

function* gen() {
    yield
    function() {};
}

Steps to Reproduce

% node test.js
// no error

% js-beautify -r test.js
beautified test.js
% node test.js
test.js:4
    function() {};
            ^

SyntaxError: Unexpected token (