error_or: getLastError example

gistfile1.cpp

// GetLastError is no better
Foo* makeAFoo(int param1, int param2)
Foo* newFoo = makeAFoo(42, 0);
// Easy to forget to call this...
Status s = getLastError();
if (s) {
    newFoo->doSomething();
} else {
    // handle Error
}