test/mjsunit/compiler/dead-string-add.js

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function dead1(a, b) {
    var x = "a" + "b";
    return a; // x, "a", and "b" are dead code
}

function dead2(a, b) {
    var x = a + "0";
    var y = b + "0";
    return a; // x and y are both dead
}

function dead3(a, b) {
    a = a ? "1" : "0";
    b = b ? "1" : "0";
    var x = a + "0";
    var y = b + "0";
    return a; // x and y are both dead
}

assertEquals(33, dead1(33, 32));
assertEquals(33, dead2(33, 32));
assertEquals("1", dead3(33, 32));

assertEquals(31, dead1(31, 30));
assertEquals(31, dead2(31, 30));
assertEquals("1", dead3(31, 32));

assertEquals(0, dead1(0, 30));
assertEquals(0, dead2(0, 30));
assertEquals("0", dead3(0, 32));

assertEquals(true, dead1(true, 0));
assertEquals(true, dead2(true, 0));
assertEquals("1", dead3(true, 0));

assertEquals("true", dead1("true", 0));
assertEquals("true", dead2("true", 0));
assertEquals("1", dead3("true", 0));