non_ascii_function_identifier_name: {
    input: {
        function fooλ(δλ) {}
        function λ(δλ) {}
        (function λ(δλ) {})()
    }
    expect_exact: "function fooλ(δλ){}function λ(δλ){}(function λ(δλ){})();"
}

iifes_returning_constants_keep_fargs_true: {
    options = {
        keep_fargs    : true,
        side_effects  : true,
        evaluate      : true,
        unused        : true,
        dead_code     : true,
        conditionals  : true,
        comparisons   : true,
        booleans      : true,
        if_return     : true,
        join_vars     : true,
        reduce_vars   : true,
        cascade       : true,
    }
    input: {
        (function(){ return -1.23; }());
        console.log( function foo(){ return "okay"; }() );
        console.log( function foo(x, y, z){ return 123; }() );
        console.log( function(x, y, z){ return z; }() );
        console.log( function(x, y, z){ if (x) return y; return z; }(1, 2, 3) );
        console.log( function(x, y){ return x * y; }(2, 3) );
        console.log( function(x, y){ return x * y; }(2, 3, a(), b()) );
    }
    expect: {
        console.log("okay");
        console.log(123);
        console.log(void 0);
        console.log(2);
        console.log(6);
        console.log((a(), b(), 6));
    }
}

iifes_returning_constants_keep_fargs_false: {
    options = {
        keep_fargs    : false,
        side_effects  : true,
        evaluate      : true,
        unused        : true,
        dead_code     : true,
        conditionals  : true,
        comparisons   : true,
        booleans      : true,
        if_return     : true,
        join_vars     : true,
        reduce_vars   : true,
        cascade       : true,
    }
    input: {
        (function(){ return -1.23; }());
        console.log( function foo(){ return "okay"; }() );
        console.log( function foo(x, y, z){ return 123; }() );
        console.log( function(x, y, z){ return z; }() );
        console.log( function(x, y, z){ if (x) return y; return z; }(1, 2, 3) );
        console.log( function(x, y){ return x * y; }(2, 3) );
        console.log( function(x, y){ return x * y; }(2, 3, a(), b()) );
    }
    expect: {
        console.log("okay");
        console.log(123);
        console.log(void 0);
        console.log(2);
        console.log(6);
        console.log((a(), b(), 6));
    }
}