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// Some experimental features are enabled only on nightly builds, and disabled
// on beta and release. Tests for these features should not simply disable
// themselves on all but nightly builds, because if we neglect to update such
// tests once the features cease to be experimental, we'll silently skip the
// tests on beta and release, even though they should run.
// Call the function f. On beta and release, expect it to throw an error that is
// an instance of error.
function nightlyOnly(error, f) {
if (getBuildConfiguration("release_or_beta")) {
try {
f();
throw new Error("use of feature expected to fail on release and beta, but succeeded; please update test");
} catch (e) {
if (!(e instanceof error)) {
throw e;
}
// All is well.
}
} else {
f();
}
}
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