test/compress/issue-913.js


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keep_var_for_in: {
    options = {
        hoist_vars: true,
        unused: true,
    }
    input: {
        (function(obj){
            var foo = 5;
            for (var i in obj)
                return foo;
        })();
    }
    expect: {
        (function(obj){
            var i, foo = 5;
            for (i in obj)
                return foo;
        })();
    }
}