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// Should not crash.

pattern = RegExp("","");  // RegExp is irrelevant, as long as it's not an atom.
string = 'a';             // Anything non-empty (flat ASCII).
pattern.exec(string);     // Ensure that JSRegExp is compiled.
pattern["@"] = 42;        // Change layout of JSRegExp object.
pattern.exec(string);     // Call again to trigger bug in stub.