src/third_party/mozjs-45/js/src/jit-test/tests/gc/bug-1137341.js

if (helperThreadCount() == 0)
   quit();

gczeal(0);
gc();

schedulegc(this);
startgc(0, "shrinking");
var g = newGlobal();
g.offThreadCompileScript('debugger;', {});
g.runOffThreadScript();