// location at 0x4553ee, with file/line/function symbolization info representing
// the three layers of calls. It does that via sequential calls to pcDeck.tryAdd
// starting with the leaf-most address. The fourth call to pcDeck.tryAdd will be
// for the caller of main.main. Because main.main was not inlined in its caller,
// the deck will reject the addition, and the fourth PC on the stack will get
// its own location.