bug2045577.js - mozsearch

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class SubRE extends RegExp {}

var sub = new SubRE("x");   // subclassed RegExp: [[LegacyFeaturesEnabled]] = false

var re = /(abc)/;           // normal RegExp: [[LegacyFeaturesEnabled]] = true

function hit(s) { return re.exec(s); }

for (var i = 0; i < 2000; i++) hit("xabcx");

// Invalidate the statics.

sub.exec("x");

// Revalidate the statics.

hit("xabcx");

// Check that the statics are valid.

assertEq(RegExp.lastMatch, "abc");