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// frame.offset throws if !frame.onStack.
load(libdir + "asserts.js");
var g = newGlobal({newCompartment: true});
var dbg = Debugger(g);
var f;
dbg.onDebuggerStatement = function (frame) { f = frame; };
g.eval("debugger;");
assertEq(f.onStack, false);
assertThrowsInstanceOf(function () { f.offset; }, Error);