test/mjsunit/regress/regress-52801.js

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// Whenever we enter a with-scope, we copy the context. This in itself is fine
// (contexts may escape), but when leaving a with-scope, we currently also copy
// the context instead of reverting to the original. This does not work because
// inner functions may already have been created using the original context. In
// the failing test case below, the inner function is run in the original context
// (where x is undefined), but the assignment to x after the with-statement is
// run in the copied context:

// RegExp caching doesn't set lastIndex correctly.
// See http://code.google.com/p/chromium/issues/detail?id=52801

var re = /a/g;

var str = "bbbbabbbbabbbb";

// Test

re.test(str);
assertEquals(5, re.lastIndex);

re.lastIndex = 0;
re.test(str);
assertEquals(5, re.lastIndex);  // Fails if caching.

re.lastIndex = 0;
re.test(str);
assertEquals(5, re.lastIndex);  // Fails if caching.

// Exec

re = /a/g;

re.exec(str);
assertEquals(5, re.lastIndex);

re.lastIndex = 0;
re.exec(str);
assertEquals(5, re.lastIndex);  // Fails if caching.

re.lastIndex = 0;
re.exec(str);
assertEquals(5, re.lastIndex);  // Fails if caching.