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Well you could run the code in the debugger, then start single-stepping through the code.

foo.c:232:1: warning: control reaches end of non-void function [-Wreturn-type]

> for (i = startOfToken; i < strlen(token); i++)
If this is false the first time you reach it, the body of the loop...

Well you have this
while (answer.type != EOL)

But no path through getNextToken() ever sets the EOL state.