string-substring-latin1rope-with-twobyte-children.js

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let right = newRope("b", "012345678901234567890123456789");

let latin1Rope = newRope("a", right);

let twoByteRope = newRope("\u221e", right);

// Flattening |twoByteRope| changes |right| from a Latin-1 rope into a two-byte

// dependent string. At this point, |latin1Rope| has the Latin-1 flag set, but

// also has a two-byte rope child.

ensureLinearString(twoByteRope);

let result = latin1Rope.substring(0, 3);

assertEq(result, "ab0");